Topical Retinoids
- The claim
- Reverses photoaging: fewer fine lines, more even pigment, thicker dermis.
- The verdict
- The strongest-evidenced topical in dermatology, and the one most people give up on too early.
- Worth it?
- Yes. Nothing else available over a counter or on a prescription pad has this much data behind it.
What the evidence supports
Tretinoin has randomized, vehicle-controlled, histologically confirmed evidence going back to the 1980s, replicated many times since. It increases epidermal thickness and dermal collagen, improves fine lines and mottled pigmentation, and the effect builds over months rather than weeks. The limiting factor in practice is irritation in the first six to twelve weeks, which is when most people stop. Starting at a low strength two nights a week and building up is the difference between a treatment that works and a tube in a drawer.
Why this entry is short
This is a graded stub. The verdict, the grade and the citations are settled and reviewed; the long-form write-up is queued behind a recorded consult-room explanation, in the order these questions actually come up in the office. The row is here now because an evidence index with twenty honest lines is more use than one with four essays and nothing else.
What this is based on
- Weiss et al., topical tretinoin improves photoaged skin — double-blind, vehicle-controlled studyJAMA · 1988
- Griffiths et al., 0.1% versus 0.025% tretinoin over 48 weeks — similar improvement, different irritationArchives of Dermatology · 1995
- Griffiths et al., topical tretinoin for photoaging-related hyperpigmentation in Chinese and Japanese patients — vehicle-controlled trialJournal of the American Academy of Dermatology · 1994
Grades describe the quality of the human evidence, not my opinion of the treatment. Where the literature changes, the grade changes and the review date moves with it.
The full guide
All guides →Botox Timing: Starting, Spacing, and What “Preventative” Really Buys You →
When to start, how often to repeat, and what the word preventative is actually describing. The mechanism is well understood; most of the confusion is about scheduling, and most of the marketing is about starting earlier.
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