Retinoids
Tretinoin
Tretinoin / All-trans retinoic acid
Tretinoin is not skincare theatre. It is a prescription retinoid with decades of evidence for acne and photoaging, but it can absolutely damage the barrier if used casually.
Typical Concentration
0.025-0.1% prescription topical; dermatologist-guided
Best Used
Acne, PIH, Aging, Texture
Photosensitising
Yes
Pregnancy Safe
No
Results Timeline
12 weeks for acne; 6-12 months for photoaging
Moxie's Take
"Love, Love, Love. This was a game changer, took me a couple of years to actually move to this. My only regret - why I didn't start sooner! I have had the best skin upgrade with this one. Takes a WHILE to get used to it, but I promise you, absolutely worth it. Only disclaimer: this is real prescription strength, not a starter retinoid. What matters is tolerance and indication, not a birthday - if you haven't built tolerance with an OTC retinol or retinal first, or you don't have a specific concern this is actually treating, it's not the one to reach for yet, regardless of age. Go in through a dermatologist so it's matched to what your skin actually needs."
Start Here
First, try this if
Acne, photoaging, texture, PIH-prone skin under medical guidance, and users prepared for slow consistent use.
Don't expect
Results build gradually, not overnight — realistic timeline is 12 weeks for acne; 6-12 months for photoaging.
See a dermatologist first if
This is prescription-only — a dermatologist has to be the one who starts you on it.
What It Is
Tretinoin is retinoic acid itself — no conversion step needed — which is exactly why it's prescription-only and why it works faster and harder than retinol or even retinal. The Moxie Edit should be firm here: tretinoin is not something to copy from TikTok or buy without proper medical guidance.
How It Works
Tretinoin binds nuclear retinoic acid receptors, changing gene expression in keratinocytes and dermal cells. It normalises follicular keratinisation, reduces microcomedone formation, increases epidermal turnover, and over time can support dermal collagen changes while reducing collagen breakdown. The same potency is why early irritation is common.
The Evidence
Evidence is strong, with classic controlled studies showing improvement in photodamaged skin and extensive acne guideline support for topical retinoids. Limitations are not about whether tretinoin works; they are about tolerability, adherence, pregnancy safety, and PIH risk if irritation is unmanaged in deeper skin tones.
A systematic review and meta-analysis of 8 RCTs (n=1,361) found topical tretinoin significantly improved photoaging (coarse wrinkling, dyspigmentation, texture) vs. vehicle across follow-up periods of 16 weeks to 2 years. Widely regarded as the gold-standard retinoid for photoaging.
View source →Reviewed by Moxie — last checked July 2026
How to Use
Tips
Prescription only. Use at night on dry skin, pea-sized amount, usually 2-3 nights weekly to start unless dermatologist instructs otherwise. Moisturiser sandwiching may improve tolerance.
This one requires a dermatologist, full stop — patch testing at home isn't a substitute for medical guidance given tretinoin's potency. Start with a pea-sized amount 2-3 nights weekly on dry skin unless your dermatologist directs otherwise, and consider moisturiser sandwiching if irritation shows up.
SPF is essential and non-negotiable — tretinoin increases photosensitivity and irritation risk, both of which raise PIH risk on deeper skin tones.
Severe burning, swelling, crusting or persistent dermatitis are reasons to stop and contact your prescribing clinician, not signs to push through — this is a stronger reaction threshold than OTC retinoids.
Who It Suits
Works Well For
Acne, photoaging, texture, PIH-prone skin under medical guidance, and users prepared for slow consistent use.
Use With Caution If
Do not use without a qualified dermatologist or prescribing clinician. Avoid during pregnancy/nursing. Stop and seek advice for severe burning, swelling, crusting, or persistent dermatitis.
Darker Skin Tones (Fitzpatrick IV–VI)
Post-inflammatory hyperpigmentation (PIH) risk is higher for darker skin tones with active ingredients, heat- or light-based devices, and any procedure that causes inflammation. This does not mean avoid — it means patch test, go slower, and confirm your provider has real experience treating Fitzpatrick IV–VI skin before an energy-based or ablative treatment.
Specific To This Ingredient
For Fitzpatrick III-VI, irritation control matters. Any ingredient that causes inflammation can worsen PIH, even if it is marketed as brightening or anti-aging.
Pregnancy Note
No — avoid during pregnancy/nursing unless specialist explicitly directs
Prescription Note
Tretinoin is prescription-only and should not be used without medical supervision. Incorrect use can cause severe irritation, photosensitivity and PIH. Avoid during pregnancy/nursing unless explicitly cleared by a qualified clinician.
Combine and Avoid
Pairs Well With
Concerns Addressed
Frequently Asked Questions
Is tretinoin stronger than retinol?
Yes, significantly — it's the active retinoic acid form already, with no conversion needed, and carries the deepest clinical evidence of any retinoid, but also a real risk of irritation without medical guidance.
How long does tretinoin take to work?
Around 12 weeks for acne, and 6-12 months for photoaging changes — it requires patience and consistent, correct use.
Can I use tretinoin during pregnancy?
No — it should be avoided during pregnancy and nursing unless a specialist explicitly directs otherwise.
The Verdict
Love It
The serious retinoid.
Moxie Ratings
Not medical advice. Content is based on personal experience and published research. Always consult a qualified dermatologist before starting any new treatment or regimen.
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