Daily Health Digest

By Only Health Editorial Team

A 1,000 mg tablet looks impressive next to a 90 mg daily requirement. Here is what vitamin C actually does, what the evidence on colds really shows, and how to read a supplement label without over-buying.

By Only Health Editorial Team

UMF, MGO, monofloral, multifloral: mānuka honey labels carry more information than most jars in the pantry. Here is how to read them, what the evidence actually supports, and where a health claim goes further than the science.

By Only Health Editorial Team

A practical, source-backed guide to choosing gummies, capsules, powders, effervescent tablets, or liquids without mistaking a delivery format for proof of benefit.

By Only Health Editorial Team

Zinc supports essential body functions, but more is not automatically better. Here is how to read elemental zinc, compare food and supplement sources, and avoid common dosing mistakes.

By Only Health Editorial Team

A food-first, source-backed guide to calcium intake, vitamin D, bone health, supplement limits, and how to read a New Zealand calcium label.

By Only Health Editorial Team

Most healthy adults in New Zealand do not need a vitamin D supplement. This guide separates the well-supported skeletal benefits from marketing claims that run ahead of the evidence, using the Ministry of Health's sun exposure consensus statement, bpacnz's 2025 clinical update, Osteoporosis New Zealand, the NHS, and Harvard T.H. Chan School of Public Health.

By Only Health Editorial Team

Biotin, collagen, and keratin sit on the same beauty labels but rest on very different levels of evidence. A sourced guide to what each ingredient actually does, what trials show for hair, skin, and nails, why high-dose biotin can distort lab tests, and when hair shedding needs a doctor instead of a supplement.