Understand the source comparison
Peptide Safety Bible Side Effects Risks Everything: Full Comparison
GLP-1 Agonists (Semaglutide, Tirzepatide) Nausea, vomiting, delayed gastric emptying Slowed gastric motility, GLP-1 receptor activation in gut Slow dose titration over 8–12 weeks, smaller meal sizes, avoid high-fat foods Most GI side effects resolve within 4–6
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This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- GLP-1 Agonists (Semaglutide, Tirzepatide)
- Nausea, vomiting, delayed gastric emptying
- Slowed gastric motility, GLP-1 receptor activation in gut
- Slow dose titration over 8–12 weeks, smaller meal sizes, avoid high-fat foods
- Most GI side effects resolve within 4–6 weeks as receptor density adjusts. Starting at 0.25 mg weekly instead of 0.5 mg cuts discontinuation rates in half
- Growth Hormone Secretagogues (GHRP-2, Ipamorelin, MK-677)
- Water retention, transient hyperglycaemia, increased appetite
- Elevated GH and IGF-1 increase sodium retention and insulin resistance
- Dose every other day instead of daily, monitor fasting glucose, limit carbohydrate intake around dosing
- Daily dosing accelerates receptor desensitisation. Twice-weekly protocols maintain efficacy longer with fewer metabolic side effects
- Repair Peptides (BPC-157, TB-500)
- Injection-site discomfort, transient blood pressure changes, headache
- Local angiogenic signalling, bradykinin receptor weak binding
- Rotate injection sites, dose subcutaneously instead of intramuscularly, start at 250 mcg twice daily
- Most adverse events at doses above 500 mcg twice daily. Lower doses provide equivalent tissue repair with better tolerability
- Nootropic Peptides (Cerebrolysin, Dihexa, P21)
- Headache, irritability, sleep disturbance
- Increased BDNF, neurotrophin receptor activation, enhanced synaptic plasticity
- Dose in the morning, start at 50% of target dose, cycle 8 weeks on / 4 weeks off
- Cognitive enhancement peptides show tolerance development. Cycling prevents diminishing returns and allows receptor sensitivity to reset
- Immune Modulators (Thymalin, KPV)
- Flu-like symptoms, fatigue, localised inflammation
- Thymic peptide immune activation, cytokine release
- Dose before bed to sleep through acute-phase response, start at 1 mg twice weekly
- Immune peptides cause transient malaise because they're doing what they're designed to do. Stimulating immune activity. Symptoms resolve within 24–48 hours