Taking Supplements Without Testing Is Shooting in the Dark

The supplement industry thrives on the idea that more is better. Vitamin D, magnesium, zinc, B12 — people take handfuls without knowing their actual levels. Supplementing a nutrient you're not deficient in is at best wasted money and at worst harmful. Too much iron can damage your liver. Too much vitamin A can be toxic. Before you buy another bottle, get a blood test. Know what you actually need. A targeted approach based on data is always more effective than guessing.