How long does tretinoin take to show results?

Most users see initial texture improvements and fewer breakouts within 8–12 weeks of consistent nightly use. Fine line reduction and hyperpigmentation improvements typically appear at 6 months. Full collagen remodeling benefits take 12–24 months. Stick with it through the purge phase (weeks 2–6), this is temporary and means it is working.

What moisturizer works best with tretinoin?

Use a simple, fragrance-free, ceramide-rich moisturizer. Top choices: CeraVe Moisturizing Cream, Vanicream Moisturizing Skin Cream, or La Roche-Posay Toleriane Double Repair. Apply before tretinoin (the sandwich method) to buffer irritation, or wait 20–30 minutes after tretinoin. Avoid occlusives like petrolatum directly over tretinoin, they can increase penetration and irritation. Niacinamide-containing moisturizers are a good pairing for their barrier-repairing properties.

Can you use tretinoin every night?

Eventually yes, but start slow: use tretinoin 2–3 nights per week for the first 4–6 weeks, then increase to every other night, then nightly as tolerated. Most people reach nightly use by month 3–4. Signs you are progressing too fast: persistent redness, flaking, or burning beyond the first few minutes after application. Slow down rather than stopping entirely if irritated. SPF 30+ every morning is mandatory with tretinoin, it increases UV sensitivity.

tretinoin · Review

The Ordinary Niacinamide 10% + Zinc 1% Review

The Ordinary's under-$25 niacinamide serum is the cult skincare product everyone tries first. Here's whether it earns its reputation.

Our verdict

The Ordinary Niacinamide 10% + Zinc 1%

Under $25

Strong pick

Check price →

Last updated 2026-04-13 · 4 min read · First published 2026-04-13

Heads up: this post has affiliate links. We may earn a small commission if you buy something, at no extra cost to you. We only link to stuff we'd actually tell a friend about. Prices shown are approximate and change often; check the retailer for current pricing.

What we like

✓ 10% niacinamide at under $25, incredible value
✓ Real zinc inclusion for sebum control
✓ Pairs with literally everything
✓ Cult favorite with real receipts

What bugs us

✗ Not Premium Beauty
✗ 10% can cause flushing in sensitive skin
✗ Slightly tacky texture

The short answer

The Ordinary Niacinamide 10% + Zinc 1% is the cult skincare product everyone tries, and it actually delivers. Reduces redness, controls sebum, fades pigmentation. At under $25 it’s the cheapest skincare upgrade you can make.

The Ordinary’s universal niacinamide serum. Earned reputation.

Why it works

10% niacinamide is at the upper end of effective concentration. Adding 1% zinc enhances sebum-regulating effects. Drugstore-friendly price for pharmacy-grade actives.

What it does

Reduces redness (anti-inflammatory)
Controls oil (sebum regulation)
Fades hyperpigmentation (melanin transfer inhibition)
Strengthens barrier (ceramide synthesis)

When to use

Layer with virtually anything, vitamin C, retinoids, AHAs/BHAs. Apply morning or evening, between cleanser and moisturizer. Daily-friendly.

When NOT to use

If 10% causes flushing (~5% of users), try Paula’s Choice 10% Niacinamide Booster (under $50) for a more elegant formulation, or use less frequently.

Check current price on Amazon →

The verdict

Verdict: Strong pick. The cheapest universal skincare upgrade. Get it.

Ready to buy?

Grab the Niacinamide 10% + Zinc 1% on Amazon

Check current price →

Related reviews

Augustinus Bader · tretinoin

The Cream

Augustinus Bader The Cream is the celebrity-endorsed luxury moisturizer. Here's what the research and owner reviews say, and whether the TFC8 tech delivers.

Strong pickRead review →

Drunk Elephant · tretinoin

Protini Polypeptide Cream

Drunk Elephant's under-$100 Protini cream promises peptide-fueled firming. Here's what the research and owner reviews say.

Strong pickRead review →

Kiehl's · tretinoin

Ultra Facial Cream

Kiehl's Ultra Facial Cream has been a top-seller since 1990. Here's whether the under-$50 squalane-rich classic is worth it in 2026.

Strong pickRead review →

Premium Beauty

TFC8 tech. The one celebrities keep talking about.

Buy on Amazon →