Most brands use a single peptide at trace concentration and call it a 'peptide formula.' Vitēra uses five distinct growth factor peptides — Capixyl, Biopeptide-EL, AnaGain, and two supporting signal peptides — each targeting a different receptor in the follicle lifecycle simultaneously. Together they mimic the natural biochemical signals that initiate the anagen (active growth) phase, effectively waking follicles that have entered premature catagen or telogen rest. This is the mechanism responsible for the visible density shift most users report at Week 6–8.

Androgenic hair loss — the most common form in both men and women — is driven by dihydrotestosterone (DHT) binding to androgen receptors in the follicle and miniaturizing it over years. Saw palmetto inhibits 5-alpha reductase Type I and II, the enzymes responsible for converting testosterone into DHT, reducing DHT availability at the follicle without synthetic hormones or prescription intervention. Clinical studies show lipophilic saw palmetto extract at therapeutic dose is comparable in mechanism to finasteride — without the systemic hormonal side effects. Most brands include saw palmetto at sub-therapeutic doses for label appeal. Vitēra doses it to work.

Topical caffeine has two independent mechanisms that make it one of the most clinically validated ingredients in hair growth science. First: it penetrates the scalp epidermal barrier within 2 minutes of application, stimulating adenylate cyclase and increasing cAMP levels in follicle cells — this directly counteracts the DHT-induced suppression of follicle growth even when DHT is present. Second: it increases microvascular blood flow in the scalp, dramatically improving delivery of oxygen, nutrients, and the other actives in the formula to follicle tissue. The combination means caffeine both blocks a DHT pathway AND amplifies the efficacy of every other ingredient applied alongside it.

Biotin deficiency is a documented cause of hair brittleness, breakage, and shedding — and while severe deficiency is rare, subclinical insufficiency at the follicle level is far more common than blood tests reveal. Topical biotin at therapeutic concentration bypasses the digestive absorption route entirely, delivering B7 directly to keratinocytes in the follicle matrix where keratin synthesis occurs. The result is measurably stronger hair shafts, reduced mechanical breakage, and less of the diffuse shedding that mimics hair loss but is actually structural damage. Most oral biotin supplements deliver a fraction of the dose required for follicle-level effect — topical delivery changes the bioavailability equation entirely.

Chronic low-grade scalp inflammation is one of the most underdiagnosed drivers of hair thinning — it accelerates follicle miniaturization, triggers premature telogen entry, and degrades the epidermal barrier that keeps the scalp microbiome in balance. Niacinamide (Vitamin B3) reduces the pro-inflammatory cytokines IL-1α and TNF-α at the scalp level, directly interrupting this inflammatory cascade before it damages follicle architecture. It simultaneously strengthens the stratum corneum, reducing transepidermal water loss and creating the optimal hydrated, low-inflammation environment for the peptide complex and caffeine to penetrate and work effectively. Think of it as preparing the ground before planting — every other active performs better when niacinamide has done its job first.