What is tretinoin and is it safe for beginners?

Tretinoin is a prescription-strength retinoid (vitamin A derivative) and the gold standard for anti-aging and acne treatment. It works by accelerating skin cell turnover, stimulating collagen production, and unclogging pores. For beginners: start at the lowest concentration (0.025%) and apply every other night to clean, completely dry skin; the 'sandwich method' (apply moisturizer, wait 10 minutes, apply tretinoin, moisturizer again) reduces irritation. Expect 4-6 weeks of purging (temporary breakouts as congestion surfaces) and dryness before improvement. Avoid during pregnancy. Results for fine lines typically appear at 3-6 months; full collagen remodeling takes 12+ months. Pair with SPF 30+ every morning without exception — tretinoin increases UV sensitivity significantly.

How do I build a simple skincare routine?

A minimal effective skincare routine — morning: (1) Gentle cleanser (CeraVe Hydrating, La Roche-Posay Toleriane); (2) Moisturizer with ceramides or hyaluronic acid; (3) Broad-spectrum SPF 30+ (non-negotiable — UV is the #1 cause of premature aging and skin cancer). Evening: (1) Cleanser to remove SPF and pollution; (2) Active treatment if using one (retinoid, AHA/BHA, niacinamide — introduce one at a time, not together); (3) Moisturizer. What not to do: layering too many actives causes irritation and reduces efficacy; introduce one new product per month to identify reactions; fragrance is the most common skincare allergen and adds no benefit. For most people: SPF in the morning and a retinoid at night (started slowly) will produce better results than any 10-step routine without those two.

What SPF should I use daily, and does SPF 50 really matter over SPF 30?

SPF 30 blocks ~97% of UVB rays; SPF 50 blocks ~98%; SPF 100 blocks ~99%. The difference sounds small but matters for daily cumulative exposure: dermatologists recommend SPF 30 as the minimum and SPF 50 for extended outdoor time or sensitive/post-procedure skin. More important than SPF number: broad-spectrum labeling (covers both UVA and UVB — UVA causes aging, UVB causes burns; both cause cancer); application amount (most people apply 25-50% of the required amount, effectively halving their SPF); and reapplication every 2 hours outdoors. Mineral (zinc oxide, titanium dioxide) vs. chemical: mineral sunscreens sit on top of skin and deflect UV — better for sensitive/acne-prone skin but can leave a white cast; chemical absorb UV and convert to heat — lighter feel, better for daily wear under makeup. Best daily SPF: one you'll actually use every day. Consistency beats high SPF applied sporadically.

Best of · guides

Best Exfoliant for Sensitive Skin

Sensitive skin needs PHA or lactic acid. Here are the 5 gentlest picks.

Last updated July 10, 2026 · 5 min read

Our #1 pick

Best overall

Naturium

PHA Topical Acid 12%

~$16

Gluconolactone PHA — gentlest exfoliant

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The short answer

Best exfoliants for sensitive skin: Naturium PHA Topical Acid 12% ($16), The Ordinary Lactic Acid 10% ($8), Paula's Choice 1% BHA (premium 10%), Inkey List PHA Toner, and Krave Beauty Kale-Lalu-yAHA. PHAs are gentlest; lactic is next.

Sensitive skin should start with PHA (polyhydroxy acid) — largest molecule, gentlest. Graduate to lactic (larger AHA) if tolerated. Skip glycolic for most sensitive skin.