Every recommendation we make is backed by peer-reviewed research. This is the library.
Topical niacinamide reduced oil production and inflammatory breakouts in people with acne-prone skin.
It was a short topical trial, so it does not tell us how niacinamide compares with prescription acne treatments over the long term.
Niacinamide lightened dark patches by limiting how much pigment skin cells pass to the surface.
Improvements were measured over a few months in a limited group, so results may differ across skin tones and longer timeframes.
Topical retinol visibly smoothed fine lines and improved texture in naturally aged skin over several months.
It followed older adults using a single retinol strength, so it does not establish the best concentration or results for younger skin.
Topical vitamin C faded melasma about as effectively as a standard prescription brightener.
It was a small comparison trial, so it does not confirm how vitamin C performs across larger or more diverse groups.
A ceramide-rich moisturizer measurably strengthened a weakened skin barrier within a few weeks.
The trial was short and focused on barrier measurements, so it does not show long-term comfort or results for every skin type.
A topical hyaluronic acid serum improved skin hydration and elasticity over about two months.
It studied one formulation in a small group, so results may not extend to every hyaluronic acid product.
This review explains how androgen hormones drive the oil glands that fuel hormonal acne.
It is a mechanism review rather than a treatment trial, so it does not measure how well any specific therapy works.
This review links an imbalanced gut and skin microbiome to inflammatory skin conditions like acne and rosacea.
It summarizes associations rather than proving that changing the microbiome clears these conditions.
This review describes how falling estrogen after menopause reduces skin collagen and slows repair.
It is a summary of mechanisms, so it does not establish how much any treatment can offset these changes.
This review connects chronic stress and raised cortisol to faster skin aging and a weaker barrier.
It draws on varied studies rather than one controlled trial, so individual stress effects will differ.
This review found omega-3 supplements can calm inflammatory acne over several weeks.
Pooled results came from differing doses and populations, so the ideal amount and who benefits most remain unclear.
Oral zinc reduced mild-to-moderate inflammatory acne in a controlled trial.
It studied a specific zinc regimen short-term, so it does not address long-term safety or results for severe acne.
A probiotic supplement lowered acne lesion counts over about three months.
The trial was small and strain-specific, so generic probiotics may not produce the same effect.
Over four and a half years, people using sunscreen daily showed less visible skin aging than those using it occasionally.
It was conducted in one adult population and cannot isolate sunscreen from other sun-protective habits.
Across several trials, oral collagen peptides improved skin elasticity and reduced wrinkle depth over two to three months.
The pooled trials used different products and were often industry-funded, so results should be read with caution.
Drinking spearmint tea twice daily lowered free testosterone and eased hormonal acne over a month.
It was a small, short study in women with PCOS, so it may not apply to other causes of acne.
This review associates low vitamin D with acne, eczema, and psoriasis.
It shows associations, not that supplementing vitamin D treats these conditions.
Azelaic acid faded melasma comparably to a standard prescription brightener, with good tolerance across skin tones.
It was a single comparison trial, so longer-term and larger-scale results are not established.
Poor sleepers showed more signs of skin aging and slower recovery after sun exposure than good sleepers.
As an observational study it links sleep to skin changes but cannot prove sleep is the direct cause.
This review explains how high-glycemic foods and dairy raise insulin signals that can worsen acne.
It summarizes dietary mechanisms rather than testing a specific eating plan in a controlled trial.
PubMed IDs are verified against NIH records. Studies without a PubMed link are under verification.