Cosmetic ingredients, routines and protocols graded by evidence: working concentrations, skin-type limits and marketing claims without clinical support.
This section covers cosmetic formulations, active ingredients, and skincare protocols. Most industry claims of 'anti-aging,' 'restoring,' or 'nourishing' lack clinical proof – SCCS and FDA approval addresses safety, not efficacy. Full clinical evidence exists for a narrow set of compounds: retinoids and derivatives, niacinamide, azelaic acid, AHA/BHA acids, vitamin C, hyaluronic acid, ceramides, peptides, and SPF filters. Articles cover active ingredients by evidence level, working concentrations, restrictions by skin type and condition (rosacea, acne, sensitive skin, pregnancy), routine combinations and conflicts, and marketing pitfalls and claims without PubMed-indexed support.
Short answer: retinoids, hydroquinone, oxybenzone, octocrylene and fragrance phthalates are avoided through the whole lactation. Niacinamide, azelaic acid 15–20%, bakuchiol, mineral SPF and most moisturizers are safe. We break down ingredient classes, postpartum melasma and acne strategy, and what to do about hair dye and antiperspirants.
A four-night routine of exfoliant, retinoid, and two recovery nights collected a billion views online. The idea is sound, but the actual evidence sits in the individual components, not the schedule itself. Where it works, where it's oversold, and who really benefits from the calendar.
Sunscreen filters fall into three generations. The modern ones cover the full spectrum and stay photostable. The older ones protect worse and bring extra risks. What to look for on the label is below.
INCI is not alchemy, it's EU regulation. The first five ingredients drive 80% of the product. Here is how our traffic-light works and why color matters.
Retinol has decades of RCTs behind it. Bakuchiol has one sponsored trial with 44 participants. Here is where the hype ends and clinical reality begins.
Dryness, flaking, and stinging during the first 4-12 weeks on a retinoid are not a sign of a bad moisturizer – they are a predictable barrier response to accelerated epidermal turnover. We break down which ingredients actually rebuild the skin: ceramides NP in a 3:1:1 ratio, panthenol 2-5%, niacinamide 4-5%, madecassoside. And what to postpone – AHA/BHA acids, vitamin C above 10%, benzoyl peroxide, physical scrubs. Plus the author's own case of stabilizing on azelaic acid after an over-active routine.
Short answer: salicylic acid is safe topically at concentrations up to 2% on limited areas during pregnancy. Peels with concentrations above 2%, application to large body surfaces, and high-dose systemic aspirin are not. We break down trimester-by-trimester rules, safe alternatives, and pregnancy acne management per AAD 2024 and Spanish SEGO 2023.
Hyaluronic acid in skincare works only on the surface of the stratum corneum – the molecule is too large to cross the epidermis. Where it actually helps, which marketing claims don't hold up, and how it differs from the injectable form.
One ingredient works on acne, rosacea, post-inflammatory pigmentation, and is safe in pregnancy. Sounds like marketing – but azelaic has 30 years of trials behind it. Where it really works, where it's overhyped, and which concentration you actually need.
Hawaii, Palau, Key West – jurisdiction after jurisdiction banning old UV filters. It's not only coral reefs: systemic absorption and degradation to benzophenone make these molecules obsolete.
Pilling is not magic. It is polymer-film physics where two films refuse to blend. Five INCI markers tell you before you buy.
Oral isotretinoin – hard no. Tretinoin – probably no, caution without strong data. Retinol – gray zone. Retinyl palmitate – fine. Bakuchiol – safer bet.
A 1960s Procter & Gamble experiment on pure substances under extreme heat spawned a myth that refuses to die. In modern leave-on formulas at room temperature, nothing bad happens.