Niacinamide, Explained: What the Studies Support and What They Don't
The brightening evidence covers 5 percent, the sebum work covers 2 percent, and the label rarely tells you which study your bottle is leaning on.
Written by Sarah CollinsDietary Supplements
Beauty analyzes products at the level of the formula: active ingredient, concentration, delivery system and the evidence supporting each claim. Coverage spans skincare, sun protection, hair treatment and in-clinic procedures, with realistic timelines for visible change and clear notes on when a dermatologist is the better purchase.
Skincare and haircare examined by formulation: which actives work at which concentrations, how long results take, and where topical treatment stops.
Niacinamide and Dark Spots: What the Clinical Trials Actually Show
Two vehicle-controlled trials measured pigment, not promises — here is what a decade of niacinamide research does and does not support.
Written by Sarah Collins
Green Tea Extract and the Liver: Reviewing the Safety Reports Behind the Warning Labels
The NIH LiverTox database counts at least 100 published liver-injury cases linked to green tea extract, and Europe's food-safety agency flagged doses of 800 mg EGCG and above in 2018.
Written by Sarah Collins
Iron Supplementation: When Ferritin Has Meaning, and Why the Dosage Advice Changed
A ferritin below 15 micrograms per liter defines deficiency by the WHO's 2020 guideline — and a 2017 study found taking iron every other day absorbs more than taking it daily.
Written by Sarah Collins
Melatonin Doses in Supplements vs the Data: What 71% to 347% on the Label Means
Lab analyses found gummies and tablets ranging from 71 to 347 percent of their labeled melatonin content — while pediatric ingestions rose five-fold in a decade.
Written by Sarah Collins
Third-Party Seals on Supplement Labels: What NSF, USP, and Informed Choice Actually Verify
The FDA does not approve supplements before sale — which makes the certification programs, and their very different scopes, the only outside check many products get.
Written by Sarah Collins
Probiotic Strains, Explained: Which Claims Have Trial Evidence Behind Them
The strongest data sits in antibiotic-associated diarrhea; the weakest sits in the broad immune and mood claims printed across the rest of the shelf.
Written by Sarah Collins
Collagen Supplements and Skin: What the Clinical Trials Measured, and Who Paid for Them
A 2021 meta-analysis of 19 trials found measurable gains in hydration and elasticity — but nearly every trial tested a manufacturer's own peptide powder for eight to twelve weeks.
Written by Sarah Collins
Omega-3 Supplements and the Heart: What the Largest Trials Actually Found
VITAL, REDUCE-IT, and STRENGTH enrolled more than 40,000 people between them — and their verdicts on fish-oil capsules diverged in ways that matter on both sides of the pharmacy counter.
Written by Sarah Collins
Ashwagandha and Stress: What the Randomized Trials Support, and Where the Regulators Object
The adaptogen's trial record is real but small and extract-specific — and a 2023 regulatory suspension in Denmark put liver safety on the label discussion.
Written by Sarah Collins