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Saturday Skin Scalp + Hair Strengthening Peptide Treatment Versus Benton Honest Scalp Nourishing Tonic Ampoule

Saturday Skin Scalp + Hair Strengthening Peptide Treatment Versus Benton Honest Scalp Nourishing Tonic Ampoule What's inside Key Ingredients Benefits Concerns Ingredients Side-by-side Water Butylene Glycol Niacinamide Octyldodeceth-16 Polysorbate 20 Tromethami

Written by Peptide Therapy Guide Editorial Team
For education only

This guide cannot diagnose a condition or recommend a personal treatment plan. Discuss medical questions with a qualified professional.

Saturday Skin Scalp + Hair Strengthening Peptide Treatment Versus Benton Honest Scalp Nourishing Tonic Ampoule

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Butylene Glycol

Niacinamide

Octyldodeceth-16

Polysorbate 20

Tromethamine

Acrylates/C10-30 Alkyl Acrylate Crosspolymer

Menthol

Sodium Benzoate

Salicylic Acid

Caffeine

Chlorella Vulgaris Extract

Glucose

Panthenol

Potassium Sorbate

Fructooligosaccharides

Fructose

Glycerin

1,2-Hexanediol

Menthyl PCA

Ethyl Menthane Carboxamide

Glycine Soja Seed Extract

Saccharomyces Cerevisiae Extract

Caprylic/Capric Triglyceride

Propylheptyl Caprylate

Hydrogenated Lecithin

Propanediol

Pentylene Glycol

Cocoglycerides

Phenyl Trimethicone

Cynanchum Atratum Extract

Ethylhexylglycerin

Octanediol

Caprylyl Glycol

Althaea Rosea Flower Extract

Dipotassium Glycyrrhizate

Serine

Glutamic Acid

Ceramide NP

Cholesterol

Stearic Acid

Aspartic Acid

Leucine

Sh-Oligopeptide-1

Sh-Polypeptide-1

Sphinganine

Phosphatidylcholine

Alanine

Lysine

Arginine

Tyrosine

Phenylalanine

Proline

Threonine

Valine

Isoleucine

Polyglyceryl-10 Laurate

Histidine

Cysteine

Methionine

Tocopherol

Acetyl Hexapeptide-8

Copper Tripeptide-1

Palmitoyl Pentapeptide-4

Tripeptide-1

Glycine Soja Oil

Alanine/Histidine/Lysine Polypeptide Copper Hcl

Hexapeptide-9

Palmitoyl Tripeptide-1

Sh-Oligopeptide-14

Sh-Oligopeptide-2

Sh-Polypeptide-45

Sh-Polypeptide-7

Sh-Polypeptide-9

Water, Butylene Glycol, Niacinamide, Octyldodeceth-16, Polysorbate 20, Tromethamine, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Menthol, Sodium Benzoate, Salicylic Acid, Caffeine, Chlorella Vulgaris Extract, Glucose, Panthenol, Potassium Sorbate, Fructooligosaccharides, Fructose, Glycerin, 1,2-Hexanediol, Menthyl PCA, Ethyl Menthane Carboxamide, Glycine Soja Seed Extract, Saccharomyces Cerevisiae Extract, Caprylic/Capric Triglyceride, Propylheptyl Caprylate, Hydrogenated Lecithin, Propanediol, Pentylene Glycol, Cocoglycerides, Phenyl Trimethicone, Cynanchum Atratum Extract, Ethylhexylglycerin, Octanediol, Caprylyl Glycol, Althaea Rosea Flower Extract, Dipotassium Glycyrrhizate, Serine, Glutamic Acid, Ceramide NP, Cholesterol, Stearic Acid, Aspartic Acid, Leucine, Sh-Oligopeptide-1, Sh-Polypeptide-1, Sphinganine, Phosphatidylcholine, Alanine, Lysine, Arginine, Tyrosine, Phenylalanine, Proline, Threonine, Valine, Isoleucine, Polyglyceryl-10 Laurate, Histidine, Cysteine, Methionine, Tocopherol, Acetyl Hexapeptide-8, Copper Tripeptide-1, Palmitoyl Pentapeptide-4, Tripeptide-1, Glycine Soja Oil, Alanine/Histidine/Lysine Polypeptide Copper Hcl, Hexapeptide-9, Palmitoyl Tripeptide-1, Sh-Oligopeptide-14, Sh-Oligopeptide-2, Sh-Polypeptide-45, Sh-Polypeptide-7, Sh-Polypeptide-9

Lactobacillus/Leaf Ferment Filtrate 60%

Ecklonia Cava Extract

C12-13 Alketh-9

Allantoin

Betaine Salicylate

Hydrolyzed Silk

Coptis Japonica Root Extract

Morus Alba Bark Extract

Sophora Flavescens Root Extract

Scutellaria Baicalensis Root Extract

Sodium Phytate

Alteromonas Ferment Extract

Glycine

Betaine

Palmitoyl Tripeptide-5

Houttuynia Cordata Extract

Camellia Sinensis Leaf Extract

Perilla Frutescens Leaf Extract

Glycine Max Seed Extract

Polyglyceryl-10 Stearate

Biotin

Sodium Ascorbyl Phosphate

Beta-Glucan

Folic Acid

Pyridoxine

Cyanocobalamin

Beta-Carotene

Linoleic Acid

Thiamine Hcl

Riboflavin

Menthyl Lactate

Citric Acid

Sodium Citrate

Melaleuca Alternifolia Leaf Oil

Mentha Piperita Oil

Parfum

Lactobacillus/Leaf Ferment Filtrate 60%, Water, Butylene Glycol, Saccharomyces Cerevisiae Extract, 1,2-Hexanediol, Ecklonia Cava Extract, C12-13 Alketh-9, Glycerin, Propanediol, Panthenol, Polyglyceryl-10 Laurate, Arginine, Niacinamide, Allantoin, Betaine Salicylate, Caffeine, Hydrolyzed Silk, Coptis Japonica Root Extract, Morus Alba Bark Extract, Sophora Flavescens Root Extract, Scutellaria Baicalensis Root Extract, Sodium Phytate, Alteromonas Ferment Extract, Glycine, Betaine, Palmitoyl Tripeptide-5, Acetyl Hexapeptide-8, Houttuynia Cordata Extract, Camellia Sinensis Leaf Extract, Perilla Frutescens Leaf Extract, Glycine Max Seed Extract, Polyglyceryl-10 Stearate, Serine, Glutamic Acid, Aspartic Acid, Leucine, Alanine, Lysine, Tyrosine, Phenylalanine, Valine, Threonine, Proline, Isoleucine, Biotin, Histidine, Cysteine, Methionine, Sodium Ascorbyl Phosphate, Beta-Glucan, Folic Acid, Pyridoxine, Tocopherol, Cyanocobalamin, Beta-Carotene, Linoleic Acid, Thiamine Hcl, Riboflavin, Menthol, Menthyl Lactate, Ethylhexylglycerin, Citric Acid, Sodium Citrate, Hydrogenated Lecithin, Caprylyl Glycol, Melaleuca Alternifolia Leaf Oil, Mentha Piperita Oil, Parfum

Alternatives

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

1,2-Hexanediol is a synthetic liquid and another multi-functional powerhouse.

It is a:

Humectant, drawing moisture into the skin

Emollient, helping to soften skin

Solvent, dispersing and stabilizing formulas

Preservative booster, enhancing the antimicrobial activity of other preservatives

Acetyl Hexapeptide-8 (also known as Argireline) is a synthetic hexapeptide that is often called a "topical Botox alternative".

It works by mimicking how Botox relaxes muscles; it interferes with the signaling process that tells your facial muscles to contract. This can help soften expression lines like forehead wrinkles or crow's feet over time.

The comparison to Botox does have limits because the molecule is water-loving and relatively large.

Acetyl Hexapeptide-8 has a hard time absorbing deeply enough through the skin's outer barrier to actually reach the muscles.

So whether it truly works the way Botox does at a biological level is still up for debate, but early clinical outcomes are fairly encouraging.

A 12 week human study of a multi-ingredient regimen containing this ingredient saw:

While some studies have observed improvements in wrinkle appearance, it is important to note that more consistent results are seen in multi-ingredient formulations (vs just Acetyl Hexapeptide-8 alone).

Some research studies also used higher concentrations (up to 10%) while this ingredient is usually found in concentrations up to 0.005% in leave-on formulations.

Alanine is an amino acid and is already found in the human body. Our skin uses alanine to build collagen, elastin, and keratin.

Arginine is a semi-essential amino acid. This just means our bodies can product a bit on its own, but sometimes needs a little boost from food sources.

It is a part of your skin's natural moisturizing factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy.

Here's an interesting thing about Arginine: your skin converts it into urea through the Krebs-Henseleit urea cycle. Urea is one of the most effective humectants your skin naturally produces.

A clinical study showed applying 2.5% arginine hydrochloride to atopic dermatitis skin showed significant urea levels in the stratum corneum and improved moisture in just four weeks.

Arginine is also a precursor to nitric oxide; nitric oxide improves microcirculation and supports wound healing and collagen synthesis.

One study found that an amino acid complex containing Arginine reduced skin irritation, improved hydration, and accelerated skin repair in clinical / in-vivo studies.

Arginine itself is an amino acid and not a fatty acid, oil, or ester. On its own, it's not a direct food source for Malassezia, or the yeast that causes fungal acne.

Aspartic Acid is an amino acid that our bodies produce naturally. It is an antioxidant.

Our body uses Aspartic Acid to help build collagen and elastin. It also plays a role in hydrating skin.

Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:

Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.

Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.

Caffeine is a naturally occurring plant compound found in coffee beans, tea leaves, cocoa pods, and guarana.

As an antioxidant, caffeine protects your skin from free radical damage caused by UV exposure and envionrmnetal stressors.

Early research also shows that caffeine can help calm redness, soothe irritated skin, and support hair growth by stimulating microcirculation in the scalp.

You might have seen eye creams marketing caffeine as a depuffing ingredient. This is because it is a vasoconstrictor meaning it can temporarily constrict blood vessels, though clinical evidence for this specific use is still limited.

Most skincare products contain this ingredient at concentrations between 1-6%. It is able to penetrate skin easily regardless of skin type or thickness.

Just so you know, a very small number of case reports describe caffeine-induced allergy. This ingredient is generally well-tolerated, non-irritating, and non-sensitizing for the majority of people.

Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created.

Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin.

Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on).

Cysteine is a sulfur-containing amino acid that your body naturally makes and uses to build keratin (the protein in your hair, skin, and nails) and gluthatione (a major internal antioxidant).

In skincare, it's mostly added as an antioxidant. Some emerging research is also looking at its role in wound healing + evening out pigmentation though most of the pigmentation data comes from oral supplements rather than topical use).

Typical use concentrations for this ingredient are usually quite low (under 5% in leave-on skincare).

Safety data on cysteine specifically shows it's not a skin or eye irritant.

Ethylhexylglycerin is created from glycerin. It is a multitasker ingredient that:

The CIR Expert Panel found minimal skin absorption or sensitization of any kind in a safety assessment. Though this ingredient is considered well-tolerated, a small number of cases of allergic dermatitis have been published since 2002. Just be sure to patch test if you are unsure.

Industry-reported use ranges from 8% in rinse-off products and 2% in leave-on formulations.

Glutamic Acid is an amino acid that is found in all living organisms. Our bodies use this to help nerve cells in the brain communicate with other cells.

In cosmetics, glutamic acid is a famous humectant. It draws water from the air to your skin, keeping your skin hydrated (like hyaluronic acid).

An in-vitro study from 2024 found glutamic acid to play a role in inhibiting inflammation and thus a potential skin-soothing ingredient.

Other studies show it to be have potential wound healing, skin barrier repair, and hair growth properties.

Glutamic acid has poor solubility in water and other solvents.

Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.

Topically, glycerin does several things at once:

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

Histidine is a semi-essential amino acid used by our bodies to create protein. It has humectant and skin conditioning properties.

Our bodies use histidine to create filaggrin - filaggrin is a structural protein that the skin uses in maintaining skin barrier.

One study found histidine and carnosine to be a dynamic duo for your skin:

Oral histidine has also been found to help with filaggrin-deficit skin disorders such as atopic dermatitis.

Why is it considered a semi-essential amino acid? This is because adults are able to create it but children must get it from their diet.

Hydrogenated Lecithin is a more stable version of lecithin.

It's made by taking lecithin (a phospholipid commonly found in soybeans and egg yolks) and hydrogenating it. This just means the unsaturated fatty acids are turned into saturated ones so they don't go bad as easily.

This ingredient is an emollient, emulsifier, and penetration enhancer. As an emollient, it helps soften and hydrate skin by trapping moisture within. As an emulsifier, it prevents oil and water ingredients from separating.

Hydrogenated Lecithin can form tiny spherical structures made of phospholipid bilayers called liposomes. These liposomes are able to capture compounds inside their structure and deliver them through the skin barrier.

Because phospholipids are a natural component of our cell membranes, this ingredient is inherently compatible with skin.

A 2021 study found lecithin-based surfactants were less harsh and more tolerable comared to Sodium Lauryl Sulfate (SLS).

Isoleucine is an amino acid that helps reinforce our skin barrier. This amino acid plays a role in creating protein for the body.

Fun fact: Isoleucine is found in meat, fish, dairy, legumes, and nuts.

Leucine is a small amino acid and one of the building blocks your body uses to make proteins.

It's also naturally found in your skin as part of your Natural Moisturizing Factor (NMF). Your NMF is a mix of water-binding molecules that keeps the outer skin layer hydrated and flexible.

In skincare, it's mainly used as a skin conditioning ingredient that helps reinforce the same moisture-retention function.

You'll usually see it used at low percentages (generally under 5%) which is in line with how amino acids are used in cosmetics.

Lysine is an essential amino acid (your body cannot make it on its own). It has skin conditioning properties and one of the key players in collagen synthesis.

When your body creates collagen, lysine is basically the glue that holds everything together. It helps collagen fibers lock into each other and stay strong, with vitamin C being its trusty sidekick. Without enough lysine, this glue gets flimsy and less firm, resulting in less bouncy skin.

In skincare, lysine is mostly there to help keep your skin moisturized. It carries water through your skin's layers so everything stays plump.

So will putting lysine on your face create bouncier skin?

It's hard to say; most of the exciting collagen research on lysine comes from oral supplements or lab studies on mice. Further research is needed to truly understand what role topical lysine plays in skincare and your skin.

However, there's no harm in adding lysine to your routine as a supportive and hydrating ingredient.

Menthol is a compound found in mint plants, such as peppermint. In its pure form, it is a clear crystalline substance.

Menthol is known for its cooling sensation; however, the cooling is actually from your skin being sensitized. Menthol can worsen rosacea. We recommend speaking with a professional if you have concerns.

Menthol also has antimicrobial properties.

Methionine is a natural amino acid your skin already uses to make proteins and gluthatione (one of the body's key defense molecules against environmental stress like sun + pollution).

Its sulfur content makes it especially reactive with the free radicals that damage skin, giving it genuine antioxidant properties.

Usage percentages are usually under 1%, and usually as part of an amino acid mix designed to mimic what's naturally in skin.

One study used a combination of essential amino acids at 0.2% with supplemental methionine added and found significantly boosted collagen production in human skin.

Cosmetic industry reviewers have looked closely at methionine and other amino acids and found them well tolerated. Methionine is actually used as a "negative control" in lab tests designed to spot irritating ingredients because it doesn't cause a reaction.

Niacinamide is a multitasking form of vitamin B3 that strengthens the skin barrier, reduces pores and dark spots, regulates oil, and improves signs of aging.

And the best part? It's gentle and well-tolerated by most skin types, including sensitive and reactive skin.

You might have heard of "niacin flush", or the reddening of skin that causes itchiness. Niacinamide has not been found to cause this.

In very rare cases, some individuals may not be able to tolerate niacinamide at all or experience an allergic reaction to it.

If you are experiencing flaking, irritation, and dryness with this ingredient, be sure to double check all your products as this ingredient can be found in all categories of skincare.

When incorporating niacinamide into your routine, look out for concentration amounts. Typically, 5% niacinamide provides benefits such as fading dark spots. However, if you have sensitive skin, it is better to begin with a smaller concentration.

When you apply niacinamide to your skin, your body converts it into nicotinamide adenine dinucleotide (NAD). NAD is an essential coenzyme that is already found in your cells as "fuel" and powers countless biological processes.

In your skin, NAD helps repair cell damage, produce new healthy cells, support collagen production, strengthen the skin barrier, and fight environmental stressors (like UV and pollution).

Our natural NAD levels start to decline with age, leading to slower skin repair, visible aging, and a weaker skin barrier. By providing your skin niacinamide, you're recharging your skin's NAD levels. This leads to stronger, healthier, and younger looking skin.

Another name for vitamin B3 is nicotinamide. This vitamin is water-soluble and our bodies don't store it. We obtain Vitamin B3 from either food or skincare. Meat, fish, wheat, yeast, and leafy greens contain vitamin B3.

The type of niacinamide used in skincare is synthetically created.

Panthenol is a common ingredient that helps hydrate and soothe the skin. It is found naturally in our skin and hair.

There are two forms of panthenol: D and L.

D-panthenol is also known as dexpanthenol. Most cosmetics use dexpanthenol or a mixture of D and L-panthenol.

Panthenol is famous due to its ability to go deeper into the skin's layers. Using this ingredient has numerous pros (and no cons):

Like hyaluronic acid, panthenol is a humectant. Humectants are able to bind and hold large amounts of water to keep skin hydrated.

This ingredient works well for wound healing. It works by increasing tissue in the wound and helps close open wounds.

Once oxidized, panthenol converts to pantothenic acid. Panthothenic acid is found in all living cells.

This ingredient is also referred to as pro-vitamin B5.

Phenylalanine is an amino acid. It is a skin soothing and hydrating ingredient. Amino acids play a crucial role in wound healing and skin hydration.

This ingredient is also used to help even out skin tone due to its ability to disrupt the melanin production process.

Two structures of phenylalanine exist: L-phenylalanine and D-phenylalanine. L-phenylalanine is essential, this means our bodies cannot produce it naturally and we must get it from foods. Our bodies convert D-phenylalanine to neurotransmitters, and D-phenylalanine is found in our bodies naturally.

Some foods that contain L-phenylalanine include eggs, soybeans, beef, milk.

Polyglyceryl-10 Laurate is a cleansing agent and emulsifier.

It rounds up dirt, oil, and grime, so they can be rinsed off easily as a cleanser.

On the emulsifier side, it keeps your formula smooth and well-mixed by playing peacekeeper for ingredients that don't naturally get along (like oil and water).

Because it has a C12 (lauric acid) fatty acid chain, this ingredient can potentially feed the Malassezia yeast that causes fungal acne. The Malassezia yeast prefers esters with C11-C24 fatty acids.

This ingredient is an ester of lauric acid and Polyglycerin-10.

Proline is a non-essential amino acid, meaning your body can make it on its own. In skincare, it is a skin conditioning ingredient that keeps skin soft and hydrated.

It makes up about 23% of the collagen molecule (collagen is the protein responsible for keeping your skin firm) and is involved in your skin's natural hyaluronic acid production. When applied topically, proline can penetrate the skin fairly well due to its small molecular size.

Reviews of this ingredient have found it to be neither a dermal irritant nor a sensitizer.

Fun fact: Proline can be found in protein-rich foods like meat, fish, eggs, and dairy.

Propanediol is an all-star ingredient. It softens, hydrates, and smooths the skin.

It’s often used to:

Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.

Saccharomyces Cerevisiae Extract comes from a yeast used in fermentation. It has skin conditioning properties due to its naturally occurring peptides, polysaccharides (including beta-glucans), amino acids, minerals, and vitamins.

Clinical research shows formulas that contain this ingredient can improve moisture levels and refine skin texture over time. This is associate with its ability to reduce free-radical activity and protect the skin against environmental damage.

Lab studies demonstrate that some peptide fractions in this ingredient possess antioxidant and anti-collegenase effects, helping to protect the structural proteins in skin and soothing inflammation.

Additionally, this ingredient has been shown to have antimicrobial effects against bacteria associated with acne.

Serine is a non-essential amino acid (your body makes it on its own!). It is a major player in your skin's natural moisturizing factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy.

Serine is one of your NMF's most abundant components that works as a skin-identical humectant. Its hydroxyl group grabs onto water molecules to boost hydration without any heaviness or occlusion.

Research on a hydrogel with serine confirmed this serine got delivered to your stratum corneum and demonstrated enhanced skin moisturization.

Interestingly serine also helps your skin produce filaggrin, a protein that keeps your skin barrier strong and used to create collagen.

Threonine is an amino-acid. It helps hydrate the skin and has antioxidant benefits.

Our skin uses threonine for creating collagen and elastin. Humans are not able to create threonine and must get it through eating foods such as fish, lentils, poultry, sesame seeds, and more.

Tocopherol is a fat-soluble antioxidant known as Vitamin E.

You'll find this ingredient in the vast majority of skincare (for good reason). It works to neutralize free radicals, or unstable molecules generated by UV exposure, pollution, and other environmental stressors, before they can cause oxidative damage to your skin cells.

Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.

It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.

This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.

This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.

In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.

Concentrations usually range from 0.1-1% in most leave-on products.

Tyrosine is one of the amino acids your body already uses as a protein building block. In skincare, it shows up as a skin-conditioning agent.

It's most notable for being the raw material that your skin's tyrosinase enzyme converts into melanin (skin pigment); this is why it's sometimes marketed as a "tan accelerator" in products.

However, the tanning claim is shaky. Lab studies on isolated skin cells show tyrosine can boost melanin production at fairly high concentrations but hasn't shown to speed up/deepen a tan when applied directly to skin in animal studies (up to 0.05%).

Finished cosmetic products use it at low levels (generally well under 1%). At these amounts, it's considered non-irritating and non-sensitizing based on repeat-use patch testing.

Allergy-wise, plain tyrosinase hasn't shown sensitization issues but a chemically modified relative called Oleoyl Tyrosine has had a handful of cases.

Valine is one of the essential amino acids (meaning your body can't make it on its own and has to get it from food).

In skincare, it's usually synthetically-made or pulled from plant proteins like soy.

It's one of the small building blocks that make up your skin's natural moisturizing factor (NMF), or the built-in system that helps skin hold onto water. So its main job in a formula is to give the skin gentle hydration and help it feel more comfortable.

Typical amounts are very tiny: roughly 0.00004%-0.5% in leave on products and up to 1% in rinse-off ones.

The Cosmetic Ingredient Review panel has looked at this ingredient and found no evidence of it being a skin irritant or allergen at cosmetic levels.

Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.

You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!

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Peptide Therapy Guide Editorial Team

Editorial team for Peptide Therapy Guide.

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