Finasteride and Testosterone Interaction: Compatible | Peptide Database

Join others researching FGL — share findings, ask questions, and learn from real experiences FGL is a synthetic peptide derived from the second fibronectin type III module of neural cell adhesion molecule (NCAM). It mimics the interaction between NCAM and fibroblast growth factor receptor 1 (FGFR1), activating downstream signaling cascades that promote synaptic plasticity, neurogenesis, and neuroprotection. Research has primarily been conducted in animal models, where FGL has shown promise for cognitive enhancement, stroke recovery, and neurodegenerative disease models. FGL binds to and activates FGFR1, triggering receptor autophosphorylation and downstream signaling through the MAPK/ERK and PI3K/Akt pathways. This activation promotes long-term potentiation (LTP), enhances synaptic plasticity, stimulates neurogenesis in the hippocampus, and provides neuroprotective effects against excitotoxicity and oxidative stress.

Treatment of overt and subclinical hypothyroidism, either as monotherapy or in combination with levothyroxine (T4). Particularly useful in patients who report persistent symptoms despite normalized TSH on T4 monotherapy, suggesting poor peripheral conversion. Emergency treatment of severe hypothyroidism presenting as myxedema coma. Intravenous T3 is preferred due to its rapid onset of action compared to T4. Supplementation in individuals with documented poor conversion of T4 to T3 due to deiodinase polymorphisms (DIO2 gene variants), chronic caloric restriction, illness, or elevated reverse T3 levels. Diagnostic use in thyroid suppression tests to differentiate between types of thyroid autonomy. Widely used in bodybuilding and physique sports to accelerate fat loss during caloric deficit. T3 increases basal metabolic rate by 10-15% at moderate doses, promoting faster utilization of stored fat. Most effective when combined with adequate protein intake and resistance training to minimize muscle catabolism. Used by biohackers and longevity-focused individuals to maintain optimal metabolic rate, particularly during extended caloric restriction, reverse dieting, or in the context of metabolic adaptation (adaptive thermogenesis). Standard component of bodybuilding contest prep stacks, typically combined with anabolic steroids (to offset catabolism) and beta-2 agonists for maximal fat mobilization in the final 6-8 weeks before competition.