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Yes, vitamin C and niacinamide work well together in modern formulations. The old myth is based on a 1960s study that doesn't apply to today's skincare. Here's the science and how to layer them.

The clean answer is morning vitamin C, night retinol. Here's why splitting them works better than layering, when you actually can use both at once, and the specific routines that get the benefits of both.

OnSkin scores ingredients and tells you if a product is a match. HadaBuddy turns your shelf into an AM/PM routine and flags conflicts between products. Here's an honest comparison of where each one wins.

Glass tracks your face with weekly skin scans and progress photos. HadaBuddy turns your shelf into an AM/PM routine and flags ingredient conflicts. Here's an honest comparison of where each one fits.

Short answer: yes, and for most people this is one of the most useful pairings in skincare. Niacinamide buffers retinol's irritation while keeping the active's full benefit. Here's how to layer them.

Both apps scan products and help you build routines. But they approach skincare differently. Here's an honest comparison of what each one does well, what they miss, and which one fits how you actually use skincare.

The short answer is 'sometimes, and only carefully.' Here's when this pairing works, when it wrecks your barrier, and three safe ways to get the benefits of both.

Looking for the best skincare scanner app for iPhone? Yuka, SkinSort, Think Dirty, INCIDecoder, and HadaBuddy all work on iOS. Here's which one fits which job, honestly.

Acne-prone skin doesn't need a 12-step routine. It needs the right 4 to 5 products used consistently. Here's what actually clears skin, based on dermatology evidence, not TikTok.

Combination skin is two problems in one face. Summer makes it worse. Here's how to balance an oily T-zone and dry cheeks without overproducing on either.

Hyaluronic acid is the most overclaimed hydrator in skincare. Here's what it genuinely does, the humidity trick that makes it work (or backfire), and how to layer it correctly.

Retinol is the single most evidence-backed anti-aging and acne ingredient in skincare. It also has a reputation for wrecking skin during the adjustment period. Here's how to start without the drama.

Winter makes dry skin drier. Here's how to adapt your routine: richer textures, occlusive moisturizers, layered hydration, and the actives to pause until spring.

Niacinamide is the most forgiving active in skincare and also the most over-hyped. Here's what it genuinely does, what it doesn't, the right concentration, and what to pair it with.

Both apps scan barcodes and flag ingredients. But they solve different problems. Here's an honest comparison of what each one does well, what they miss, and which one fits how you actually use skincare.