Tag

Immunity

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

Probiotics: uses, evidence, dosing and safety

Probiotics have one strong result, halving antibiotic-related C. difficile diarrhea, and a long list of weaker ones. Cochrane noted probiotic-company funding in 28 of the 47 trials it pooled.

Aug 6, 2026

Halved oranges and a grapefruit packed together, cut sides up

verdict

Vitamin C: uses, evidence, dosing and safety

Vitamin C has been tested against the common cold for sixty years and the answer is still a shrug: it may shorten one slightly, and taking it once a cold has started does almost nothing.

Aug 6, 2026

Sunlight dappled through a straw hat across a face

verdict

Vitamin D: uses, evidence, dosing and safety

Vitamin D is the most-studied supplement there is, and the pattern across thirteen uses is almost always the same: correcting a deficiency helps, and adding more on top of enough does not.

Aug 6, 2026