Vitamin B1 (Thiamine)

Thiamin is not known to interact with any medications, but certain medications can have an adverse effect on thiamin levels. Furosemide (Lasix), a loop diuretic, has been linked to decreased thiamin concentrations as a result of urinary thiamin loss. Fluorouracil (5-fluorouracil; Adrucil) chemotherapy might increase thiamin metabolism and block the formation of TDP, the active form of thiamin. — per the NIH Office of Dietary Supplements; general information, not medical advice.

The cheapest vitamin b1 (thiamine) we track works out to $0.02 , against a typical $0.14 across the 63 we can price per dose — about $0.46 a month at the cheapest. That is real from live Amazon US prices, not the sticker price. The full ranking is on the Best Vitamin B1 (Thiamine) page.

BulkSupplements.com Thiamine Mononitrate Powder - Vitamin B1 Powder at $0.02 — the lowest cost-per-dose vitamin b1 (thiamine) in our catalog. See the full ranking on the Best Vitamin B1 (Thiamine) page.

We're tracking 83 active Vitamin B1 (Thiamine) deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.

Across the 63 Vitamin B1 (Thiamine) deals we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) the median cost-per-dose is $0.144; the cheapest quartile comes in under $0.084 . Anything below the median is a solid deal for the same molecule.

Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.

Because of the lack of reports of adverse effects from high thiamin intakes (50 mg/day or more) from food or supplements, the Food and Nutrition Board did not establish a (UL) for thiamin; the body excretes excess thiamin in the urine. The apparent lack of toxicity may be explained by the rapid decline in absorption at intakes above 5 mg, although the FNB noted that excessive intakes could nonetheless have adverse effects — per the NIH Office of Dietary Supplements.

Groups most likely to have inadequate thiamin status include people with alcohol dependence (up to 80% of people with chronic alcoholism develop deficiency), older adults, people with HIV/AIDS or diabetes, and people who have undergone bariatric surgery. In its early stage, deficiency can cause weight loss and anorexia, confusion, short-term memory loss, muscle weakness, and cardiovascular symptoms; its most common effect is beriberi (peripheral neuropathy and wasting), and a more common U.S. manifestation is Wernicke-Korsakoff syndrome — per the NIH Office of Dietary Supplements.

Food sources of thiamin include whole grains, meat, and fish, and in the U.S. breads, cereals, and infant formulas are fortified with thiamin. The most common sources in the U.S. diet are cereals and bread, with pork another major source, while dairy products and most fruits contain little thiamin. Among the highest-providing foods listed are fortified breakfast cereals, enriched egg noodles, pork chops, trout, and black beans — per the NIH Office of Dietary Supplements.