Common active ingredients that support energy metabolism include iron, zinc, B vitamins (notably vitamin B12), chromium picolinate, and apple cider vinegar.
They are commonly sold as tablets, caplets, and gummies.
Most items list a suggested minimum age of 18 years; at least one lists 12 years. Several include warnings such as “do not use if you are pregnant or nursing” or advise consulting a doctor before use.
Labels commonly use phrasing such as “supports energy metabolism,” “promotes cellular energy,” or “may help to boost your energy levels and metabolism.”
Directions commonly list daily use: many multivitamin tablets say to take one tablet daily; some prenatal gummies say to take two gummies daily; and some metabolism gummies instruct taking one gummy ring daily.