Supplement safety

A backpacker seen from behind walks up a gravel track through a mountain valley with snowy peaks under blue sky.

Travelan colostrum showed no clear protection from travelers' diarrhea in an 850-person trial

Oct 16, 2026

Clear capsules filled with speckled brown powder lie scattered on a bright yellow surface.

Tainted supplements: which products the FDA has found to contain hidden drugs, and what was in them

Oct 14, 2026

A hand tips white capsules from an unlabelled amber bottle into an open palm against a pink background.

Nicotinamide riboside, an NAD supplement, did not slow early Parkinson's and did slightly worse than placebo

Oct 12, 2026

A beige capsule beside a small heap of beige powder, and a green and white capsule beside a heap of brown powder, on a green surface.

Kratom explained: what the leaf is, how lab-made versions differ and what the evidence shows on risk

Oct 9, 2026

Capsules spilling from a small white bowl beside halved lemons and pieces of ginger on a round cork mat.

Vitamin C did not slow abnormal blood cell growth in a 109-person trial; an unplanned tally found fewer deaths

Oct 9, 2026

Amber softgel capsules and pale round tablets scattered across a marble surface, with a tin of white capsules at the edge.

Vitamin D2 or D3: what the evidence shows after a review found D2 supplements lower the body's D3

Oct 9, 2026

An open palm holding two green-beige capsules while the other hand picks up a third.

Glucosamine and Alzheimer's: what a study tying the joint supplement to faster decline does and does not show

Oct 6, 2026

A hand dropping a white tablet into a glass of water against a lavender background.

Does magnesium help you sleep? What the trials show

Sep 29, 2026

Assorted white tablets, capsules and a red softgel on a yellow background.

Do multivitamins help people live longer? What the research shows

Sep 29, 2026

White capsules and golden softgels scattered on a marble surface.

Does vitamin D help after a heart attack? What the TARGET-D trial found

Sep 29, 2026

A clear, unlabeled bottle filled with golden softgel capsules.

Can pentadecanoic acid reverse aging? What the evidence shows

Sep 28, 2026

A person lying in bed with a cold, blowing their nose into a tissue.

Can vitamin C cure a cold? What the trials show

Sep 28, 2026

A kale salad topped with walnuts and pomegranate seeds

A compound gut bacteria make from pomegranates and walnuts strengthened the gut lining in mice

Sep 18, 2026

Mixed nuts including brazil nuts scattered on dark wood

A selenium supplement lowered long-term blood sugar by 1.2 points in eight weeks

Sep 6, 2026

A close-up of a three-lobed strawberry leaf against blurred brown undergrowth

Strawberry leaf extract failed its pre-planned memory test, then reported a win anyway

Aug 24, 2026

A glass of milk on a pale speckled surface

Calcium supplements: uses, evidence, dosing and safety

Aug 6, 2026

A macro close-up of human skin texture with fine hairs

Collagen: uses, evidence, dosing and safety

Aug 6, 2026

A pregnant woman in a coat resting both hands on her bump

Inositol: uses, evidence, dosing and safety

Aug 6, 2026

Cuts of raw red beef on a butcher counter

Iron supplements: uses, evidence, dosing and safety

Aug 6, 2026

Almonds and walnut halves scattered across a pale surface

Magnesium: uses, evidence, dosing and safety

Aug 6, 2026

Two salted salmon fillets on dark slate with lemon wedges and rosemary

Omega-3 and fish oil: uses, evidence, dosing and safety

Aug 6, 2026

A bowl of plain yogurt with strawberries and blueberries on a wooden table

Probiotics: uses, evidence, dosing and safety

Aug 6, 2026

Halved oranges and a grapefruit packed together, cut sides up

Vitamin C: uses, evidence, dosing and safety

Aug 6, 2026

A cannula taped into a patient forearm during an infusion, in black and white

High-dose vitamin D did not slow advanced bowel cancer

Aug 6, 2026

Sunlight dappled through a straw hat across a face

Vitamin D: uses, evidence, dosing and safety

Aug 6, 2026

Golden softgel capsules scattered across a white surface

Coenzyme Q10: uses, evidence, dosing and safety

Aug 5, 2026

Grey capsules spilled from a clear bottle onto a yellow background

NAC: uses, evidence, dosing and safety

Aug 5, 2026

Two cupped hands holding dark soil above a field

Selenium: uses, evidence, dosing and safety

Aug 5, 2026

A heap of pale dried ashwagandha roots on a patterned market cloth

Ashwagandha: uses, evidence, dosing and safety

Aug 3, 2026

Red barberry berries hanging from a thorned branch against soft green foliage

Berberine: uses, evidence, dosing and safety

Aug 3, 2026

Ground turmeric filling an open sack, with fragments of dried root through it

Turmeric and curcumin: uses, evidence, dosing and safety

Aug 3, 2026

Sliced raw beef resting on a wooden board in a dark kitchen

Vitamin B12: uses, evidence, dosing and safety

Aug 3, 2026

Fresh oysters on the half shell arranged on a platter of crushed ice

Zinc: uses, evidence, dosing and safety

Aug 3, 2026

A close-up of an older person's brown eye

A vitamin B3 supplement tracked far less glaucoma in at-risk eyes

Aug 2, 2026

A sleeping newborn wrapped in a white hospital blanket

Newborns who skipped vitamin K had triple the brain bleeds

Jul 28, 2026

A patient lying on the table of a CT scanner

Vitamin K2 slowed artery calcium in a two-year trial

Jul 26, 2026

A child holding a nebulizer mask to their face

Vitamin A, not D, tracked with better lungs in asthma

Jul 26, 2026

Softgel and capsule supplements scattered across a marble surface beside small bowls

US supplement use hit 60% as multivitamins fell and ashwagandha rose, across 25 years of data

Jul 25, 2026