Bayer One A Day Men's Complete Multivitamin Review

Among the ingredients at a full dose, magnesium has the most support, though results are mixed. Small placebo-controlled trials found less fatigue with 80 milligrams a day in adults with metabolic conditions ^[1] and better energy scores in women with polycystic ovary syndrome ^[2], but a fibromyalgia trial found no change ^[3]. Riboflavin is at a full dose; fortified juice eased fatigue in construction workers ^[4], but a nutrient mix with it did not help dialysis patients ^[5]. At the advised servings, vitamin D eased fatigue mainly in people who were low in it ^[6], vitamin C helped mainly people with low vitamin C ^[7], and selenium reduced tiredness most in people eating little selenium ^[8]. A large six-year trial of an antioxidant capsule with vitamin C, vitamin E, selenium and zinc found no change in vitality in healthy adults ^[9]. Vitamin A, thiamine, vitamin B6, vitamin E and calcium are well below the doses studied, and the iron amount is not shown; iron helps fatigue mainly in people low in iron ^[10]. Animal and cell studies are never counted.

Magnesium is the main ingredient here, and most of the panel is positive: six of ten recommend it, three say they use it, and one is neutral after reviewing the evidence on sleep supplements. Sleep is the main reason, and the forms named are glycinate and threonate, often taken at night, with one panelist taking 400 mg of threonate before bed and another taking glycinate every night. Others point to its role in vitamin D function, muscle and nerve health, recovery, and keeping potassium in the body, and one pairs it with protein for keeping muscle. The panel gave no cautions about magnesium and no one stopped taking it. Vitamin D is a smaller ingredient in this product, and panelists who mention it say to take it with dietary fat or in the morning, while one panelist reports that iron supplements never raised his levels and he stopped them.

Combine with: For thyroid support, pair a basic multivitamin with targeted nutrients: selenium (100-200 mcg as selenomethionine) to support T4-to-T3 conversion and protect the thyroid from oxidative stress, and zinc if the diet is low, since it also supports thyroid hormone metabolism. Iodine should only be added cautiously and ideally after testing, because excess can worsen autoimmune thyroiditis. Other helpful options include L-tyrosine (a hormone precursor), ashwagandha (some evidence for modest TSH/T4 improvement in subclinical hypothyroidism), vitamin D, and omega-3s for immune balance, plus iron and B12 if levels are low. Take meds such as a med separated by at least 4 hours from calcium, iron, and multivitamins, and consult a physician and check TSH, free T3/T4 and TPO antibodies before supplementing.