Chromium (Picolinate)
Trivalent chromium is thought to boost insulin's own action, cranking up insulin receptor tyrosine kinase activity. That mechanism used to get pinned on an oligopeptide called chromodulin, historically speaking. Whatever the exact wiring, the proposed payoff is the same: better insulin sensitivity, better glucose uptake into your cells.
Evidence
Mixed, and mixed means exactly that, not a nicer way of saying no. Many RCTs and meta-analyses in type 2 diabetes show small, inconsistent reductions in fasting glucose and HbA1c. If your baseline control is already poor, you're more likely to notice something. If it's not, don't count on it. And true dietary chromium deficiency? Genuinely rare, so most people aren't walking around with a gap to fill in the first place.
Interactions
Additive hypoglycemia with insulin and oral hypoglycemics. May reduce absorption of levothyroxine (separate doses) and can interact with antacids/H2 blockers, which lower chromium uptake; NSAIDs may increase chromium levels.
Cautions
Generally safe at typical doses; rare reports of renal and hepatic injury at very high intakes. Avoid high doses in people with kidney or liver disease. Effect on glucose is modest and inconsistent; not a replacement for standard therapy.
Food sources
Found in broccoli, whole grains, brewer's yeast, green beans, nuts, and meat; obtainable from a normal diet, where deficiency is uncommon.
