Carlson Heartbeat Elite Review

This multivitamin gives several thyroid-related nutrients at or above the doses studied. Selenium is the best supported. Pooled trials in people with Hashimoto thyroiditis found it lowered thyroid antibodies and thyroid-stimulating hormone ^[1]. In people with a mildly underactive thyroid, it restored normal function in 31 percent, against 3 percent of controls ^[2]. One review still judged the evidence too weak to recommend routine use ^[3]. Iodine helps mainly people who are short of it, for example by shrinking goiter ^[4]. Too much iodine can harm the thyroid ^[5]. In people with an underactive thyroid on medicine, adding zinc, magnesium and vitamin A raised thyroid hormone ^[6][7]. Zinc studies on their own are inconsistent ^[8]. Vitamin A here is well below the studied dose ^[9]. Coenzyme Q10 and L-carnitine are also below their studied doses ^[10][11]. Vitamin D results are mixed: one pooled analysis found lower antibodies ^[12], another found no effect on its own ^[13]. Magnesium and chromium taken with thyroid hormone tablets cut how much is absorbed, so take them hours apart ^[14][15]. Animal and cell studies are never counted.

Magnesium is the main ingredient here, and the panel leans toward it: eight of the ten spoke about it, with four recommending it, three using it, and one staying neutral. Most take it for sleep, and the forms named are glycinate and threonate, often at night, with one panelist taking 400 mg of threonate before bed and another taking glycinate every night. Others link it to muscle function, recovery, keeping potassium in the body longer, and helping the body use vitamin D, and one uses it during surgery. Zinc is the other main ingredient, with five panelists mentioning it for wound healing, testosterone, gut lining or sleep support, and one warning that too much zinc can lead to a copper shortage. Vitamin D is a smaller ingredient in this product, and several panelists take it in the morning, one with fat for better absorption.