Tretinoin is all-trans retinoic acid, the biologically active form of vitamin A that binds retinoic acid receptors and reprograms keratinocyte gene expression. Compounded and generic 0.025% creams are the standard starting strength for acne and photoaging, titrating later to 0.05% or 0.1% as tolerance builds.
What tretinoin does
Increases epidermal turnover, reduces comedone formation, disperses melanin granules, and stimulates collagen synthesis in the dermis over months. FDA-approved indications include acne vulgaris and photodamage (Renova). Effects are evidence-backed across decades of trials; no cosmeceutical retinol converts efficiently enough to match prescription tretinoin's potency at equivalent tolerability.
Retinization: weeks 1 to 8
Peeling, erythema, and purging (acne flare from accelerated turnover) are expected. Apply pea-sized amount to dry skin nightly; buffer with moisturizer before or after if irritation is intense. Sunscreen every morning is mandatory. Most patients acclimate by week 6.
0.025% vs higher strengths
0.025% delivers meaningful collagen and acne benefits with lower irritation than 0.1%. Dermatologists start low and escalate. Compounded 45g tubes align with 90-day telehealth refill cycles.
Contraindications
Pregnancy and breastfeeding, absolute avoidance. Do not combine with benzoyl peroxide in same application (deactivates tretinoin unless formulated in stable combination products like branded Epiduo).
CLYR Health offers tretinoin 0.025% cream as a preview skin SKU for provider-supervised acne and anti-aging protocols.