Daily Health Digest

By Only Health Editorial Team

Niacin can mean nicotinic acid or nicotinamide. They share a vitamin name but behave differently at supplement doses. This guide explains label terms, daily reference values, flushing, high-dose risks and the checks worth making before adding another B-complex.

By Only Health Editorial Team

Copper rarely gets its own bottle, but it sits in multivitamins, joint formulas and high-dose zinc regimens. This guide explains elemental copper, the zinc interaction that can drain it, who is genuinely at risk of too little or too much, and what New Zealand rules say about the numbers on the label.

By Only Health Editorial Team

Potassium is essential, but it can be hidden in electrolyte products, joint supplements and low-sodium salt substitutes. This guide explains elemental potassium, the label details that matter, and why kidney function and medicines can change a routine purchase decision.

By Only Health Editorial Team

Vitamin A supplements are sold for eyes, skin, and immunity, but this is the one vitamin where a large dose can be harmful within weeks. Two cancer-prevention trials stopped early after high-dose beta-carotene and retinol raised lung cancer deaths in smokers, and New Zealand caps supplement retinol at 3,000 mcg a day. Here is what the evidence supports and how to read a bottle before you buy one.

By Only Health Editorial Team

Chromium picolinate is sold across New Zealand pharmacies and supermarkets on the promise of better blood sugar control, yet the American Diabetes Association does not recommend it, the mineral has no confirmed deficiency in healthy people, and regulators still track open genotoxicity questions about the picolinate form at high doses. Here is what the research actually supports, what New Zealand's label rules require, and how to read a chromium bottle before you buy one.

By Only Health Editorial Team

Vitamin K sits quietly in green vegetables, newborn injections, and calcium-plus-K2 supplement blends, yet most shoppers never learn that K1 and K2 do different jobs or why warfarin users are told to keep their vegetable intake steady rather than low. Here is what the two forms actually do, what the bone and heart research supports, and how to read a New Zealand supplement label before adding another capsule.

By Only Health Editorial Team

Vitamin E bottles still mix IU and milligrams, natural and synthetic forms, and antioxidant marketing that outruns the evidence. Here is what alpha-tocopherol actually does, why the SELECT trial changed how researchers view high-dose vitamin E, and how to read a New Zealand label before you add another capsule to your routine.