Thorne Basic Nutrients 2/Day - NSF Certified for Sport Review

The main support for energy comes from vitamin D, which this product gives at a full studied dose. In 46 active men, the same daily amount for 12 weeks lowered fatigue and improved fitness ^[1]. In 120 tired people low in vitamin D, one large dose cut fatigue, with 72% improving versus 50% on placebo ^[2]. Deficient women had slightly better vitality after a year ^[3]. However, 34,157 older women on a lower dose saw no change in energy ^[4]. Vitamin C at this dose improved well-being and fatigue only in young adults who were low in it ^[5], and a large trial in people who were not low found no benefit ^[6]. Thiamin helped older women with a mild shortage ^[7], but a nutrient mix with thiamin, riboflavin, niacin and vitamin B6 did not ease fatigue in dialysis patients ^[8]. Vitamin B6 helped tiredness in women with premenstrual symptoms ^[9], but larger trials found no gain ^[10]. Vitamin B3 forms did not improve tiredness in a large review ^[11]. Vitamin A here is far below the dose that reduced fatigue in trials ^[12], and vitamin E is only a trace amount compared with studied doses ^[13]. Vitamin K has no supplement trial for energy ^[14]. Animal and cell studies are never counted.

This product is a multivitamin, and the panel has no statements about the product as a whole, only about its individual vitamins, all of which are smaller ingredients in this product. Vitamin D drew the most attention, with all ten panelists speaking about it, and most of the panel recommend or use it for immune, brain, mood, muscle and bone health. Doses ranged from 5,000 IU of D3 taken in the morning by two of them to 10,000 IU daily in winter from one, while one said most people only need it if they are deficient, and several advise testing blood levels and taking it with dietary fat. Vitamin C was recommended by about half the panel, often paired with collagen for joints and skin, and vitamin K2 was taken in the morning at 90 to 100 mcg by two panelists. Vitamins A and E got only neutral mentions, and no one said they stopped taking anything.

Combine with: For thyroid support, pair this multivitamin with a targeted selenium source (such as selenomethionine, about 100-200 mcg total daily intake from all sources) to support T4-to-T3 conversion and protect the thyroid from oxidative stress. Add extra vitamin D3 with K2 if blood levels are low, since deficiency is common in autoimmune thyroid conditions. Consider zinc and iron only if lab testing shows a deficiency, as iron and ferritin status affect thyroid hormone production. L-tyrosine or an ashwagandha extract may offer additional support in some people, but ashwagandha can raise thyroid hormone levels, so use it cautiously. Omega-3 fish oil can help manage inflammation. Avoid excess iodine or kelp unless advised, and take meds such as a med separated from calcium, magnesium, and multivitamins by about 4 hours. Always consult a healthcare provider and check TSH, free T3/T4, and antibodies before supplementing.