NEW
🥤 Electrolytes
Cost per serving
$0.06
vitamin · 68 active deals
The best-value Vitamin B1 right now is about $0.02 per dose — across 54 tracked products the median is $0.150/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Vitamin B1 deal here is ranked by cost per dose— what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Right now the best value across our full Vitamin B1 catalog is at $0.02 per serving.
Thiamin (vitamin B1) is a water-soluble B vitamin that the body requires for energy metabolism and, therefore, for the growth, development, and function of cells; in its main active form, thiamin diphosphate, it serves as an essential cofactor for enzymes involved in glucose, amino acid, and lipid metabolism. Supplemental thiamin is used to treat thiamin deficiency and its consequences such as beriberi and Wernicke-Korsakoff syndrome, though a Cochrane review concluded the evidence from clinical trials is insufficient to guide the dose, frequency, duration, or route of thiamin supplementation for that syndrome. It has also been studied for diabetes and heart failure, where small studies suggest possible effects on glucose levels or left ventricular ejection fraction, but the authors did not assess the clinical significance of these findings, and for Alzheimer's disease, where existing trials were too small to draw conclusions. In each of these areas the NIH notes that larger, well-designed studies are needed to determine whether thiamin supplements are beneficial — per the NIH Office of Dietary Supplements; not medical advice.
The most commonly used forms of thiamin in supplements are thiamin mononitrate and thiamin hydrochloride, which the fact sheet describes as stable and water soluble. Benfotiamine is a synthetic thiamin derivative used in some supplements that, unlike these forms, is not water soluble and is converted to thiamin in the body. Multivitamin/mineral supplements containing thiamin typically provide about 1.5 mg, and thiamin is also available in B-complex or thiamin-only 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.
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.
Every Vitamin B1 deal above is ranked by real cost per dose with no paid placement — see our and .
1 of 13 tracked Vitamin B1 brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
The for adults is 1.2 mg/day for men and 1.1 mg/day for women age 19+. Pregnant and lactating women need 1.4 mg/day. Children's RDAs range from 0.5 mg (ages 1-3) to 0.9 mg (ages 9-13). Infants have an AI of 0.2-0.3 mg/day. — per the NIH Office of Dietary Supplements; general information, not medical advice.
The Food and Nutrition Board did not establish a for thiamin, due to lack of reports of adverse effects from high intakes (50 mg/day or more) from food or supplements. The body excretes excess thiamin in urine. The board noted excessive intakes could still have adverse effects. — per the NIH Office of Dietary Supplements; general information, not medical advice.
In its early stage, thiamin deficiency can cause weight loss and anorexia, confusion, short-term memory loss and other mental signs and symptoms, muscle weakness, and cardiovascular symptoms such as an enlarged heart. The most common effect is beriberi, characterized mainly by peripheral neuropathy and wasting. Wernicke-Korsakoff syndrome is a more common manifestation of thiamin deficiency in the United States. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Groups most likely to have inadequate thiamin status include people with alcohol dependence, older adults, people with HIV/AIDS, people with diabetes, and people who have undergone bariatric surgery. Up to 80% of people with chronic alcoholism develop thiamin deficiency. — per the NIH Office of Dietary Supplements; general information, not medical advice.
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.
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 Tolerable Upper Intake Level (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.
Cost per serving
$0.06
Cost per serving
$0.45
Pricey60 servings · ~60-day supply
Cost per serving
$0.08
480 servings · ~480-day supply
Cost per serving
$0.17
120 servings · ~120-day supply
Cost per serving
$0.13
Avg·−56%120 servings · ~120-day supply
Cost per serving
$0.19
Pricey120 servings · ~120-day supply
Cost per serving
$0.31
Pricey100 servings · ~100-day supply
Cost per serving
$0.18
Avg·−32%100 servings · ~100-day supply
Cost per serving
$0.21
Pricey100 servings · ~100-day supply
Cost per serving
$0.29
Pricey100 servings · ~100-day supply
Cost per serving
$0.23
Pricey100 servings · ~100-day supply
Cost per serving
$0.17
Avg·−38%100 servings · ~100-day supply
Cost per serving
$0.15
Avg·−50%120 servings · ~120-day supply
Cost per serving
Cost per serving
$0.02
Cheap·−95%Cost per serving
$0.27
Pricey60 servings · ~60-day supply
Cost per serving
$0.12
Avg·−60%120 servings · ~120-day supply
Cost per serving
$0.08
Cheap·−76%200 servings · ~200-day supply
Cost per serving
$0.18
Avg·−32%120 servings · ~120-day supply
Cost per serving
$0.32
Pricey120 servings · ~120-day supply
Cost per serving
$0.08
Cheap·−77%100 servings · ~100-day supply
Cost per serving
$0.25
Pricey120 servings · ~120-day supply
Cost per serving
$0.19
Avg50 servings · ~50-day supply
Cost per serving
$0.16
120 servings · ~120-day supply
Cost per serving
$0.08
Cheap·−76%200 servings · ~200-day supply
Cost per serving
$0.10
Avg·−67%240 servings · ~240-day supply
Cost per serving
$0.11
Avg·−64%240 servings · ~240-day supply
Cost per serving
$0.32
120 servings · ~120-day supply
Cost per serving
$0.21
120 servings · ~120-day supply
Cost per serving
$0.15
60 servings · ~60-day supply
Cost per serving
$0.56
60 servings · ~60-day supply
Cost per serving
$1.59
22 servings · ~22-day supply
Cost per serving
$0.17
60 servings · ~60-day supply
Cost per serving
$0.12
120 servings · ~120-day supply
Cost per serving
$0.15
100 servings · ~100-day supply
Cost per serving
$0.17
60 servings · ~60-day supply
Cost per serving
$0.10
250 servings · ~250-day supply
Cost per serving
$0.11
240 servings · ~240-day supply
Cost per serving
$0.26
90 servings · ~90-day supply
Cost per serving
$0.11
Avg·−65%180 servings · ~180-day supply
Cost per serving
$0.15
Avg·−50%90 servings · ~90-day supply
Cost per serving
$0.17
Avg·−36%120 servings · ~120-day supply
Cost per serving
$0.12
Avg·−62%Cost per serving
$0.17
Avg·−40%Cost per serving
$0.15
Avg·−47%60 servings · ~60-day supply
Cost per serving
$0.20
Pricey120 servings · ~120-day supply
Cost per serving
$0.08
Cheap·−75%240 servings · ~240-day supply
Cost per serving
$0.19
Avg120 servings · ~120-day supply
Amazon.com · 🥤 Electrolytes
CPS
Price
$14.99
SuperSmart USA LLC · SuperSmart · 🌾 Vitamin B1
CPS
Price
$27.00
Micro Ingredients · Amazon.com · 🅱️ B-Complex
CPS
Price
$39.99
Amazon.com · 🅱️ B-Complex
CPS
Price
$19.95
Amazon.com · 🌾 Vitamin B1
CPS
Price
$15.99
Amazon.com · 🌾 Vitamin B1
CPS
Price
$23.05
Amazon.com · 🌾 Vitamin B1
CPS
Price
$30.59
Amazon.com · 🌾 Vitamin B1
CPS
Price
$17.99
Amazon.com · 🌾 Vitamin B1
CPS
Price
$20.93
Amazon.com · 🌾 Vitamin B1
CPS
Price
$28.99
Amazon.com · 🌾 Vitamin B1
CPS
Price
$23.49
Spring Valley · Amazon.com · 🌾 Vitamin B1
CPS
Price
$16.99
Best Naturals · Amazon.com · 🌾 Vitamin B1
CPS
Price
$17.98
BulkSupplements.com · Amazon.com · 🌾 Vitamin B1
CPS
Price
$22.97
BulkSupplements.com · Amazon.com · 🌾 Vitamin B1
CPS
Price
$30.97
Amazon.com · 🌾 Vitamin B1
CPS
Price
$15.99
Best Naturals · Amazon.com · 🌾 Vitamin B1
CPS
Price
$14.95
Amazon.com · 🌾 Vitamin B1
CPS
Price
$16.38
Amazon.com · 🌾 Vitamin B1
CPS
Price
$21.70
Best Naturals · Amazon.com · 🌾 Vitamin B1
CPS
Price
$38.19
Amazon.com · 🌾 Vitamin B1
CPS
Price
$7.83
Nutricost · Amazon.com · 🌾 Vitamin B1
CPS
Price
$29.96
Source Naturals · Amazon.com · 🌾 Vitamin B1
CPS
Price
$9.29
Amazon.com · 🦴 Calcium
CPS
Price
$18.99
Carlyle · Amazon.com · 🌾 Vitamin B1
CPS
Price
$16.29
Vitamatic · Amazon.com · 🌾 Vitamin B1
CPS
Price
$24.99
Micro Ingredients · Amazon.com · 🌾 Vitamin B1
CPS
Price
$26.99
Amazon.com · 💉 Methylcobalamin
CPS
Price
$37.99
Amazon.com · 🅱️ B-Complex
CPS
Price
$24.99
Amazon.com · 🅱️ B-Complex
CPS
Price
$8.99
Amazon.com · 🅱️ B-Complex
CPS
Price
$33.79
Amazon.com · 🅱️ B-Complex
CPS
Price
$34.99
Amazon.com · 🅱️ B-Complex
CPS
Price
$9.99
Bronson · Amazon.com · 🅱️ B-Complex
CPS
Price
$14.97
Bronson · Amazon.com · 🅱️ B-Complex
CPS
Price
$14.99
Bronson · Amazon.com · 🅱️ B-Complex
CPS
Price
$9.99
Bronson · Amazon.com · 🅱️ B-Complex
CPS
Price
$24.99
Micro Ingredients · Amazon.com · 🅱️ B-Complex
CPS
Price
$26.95
Amazon.com · 🅱️ B-Complex
CPS
Price
$22.95
Amazon.com · 🌾 Vitamin B1
CPS
Price
$19.99
Carlyle · Amazon.com · 🌾 Vitamin B1
CPS
Price
$13.59
Source Naturals · Amazon.com · 🌾 Vitamin B1
CPS
Price
$20.81
Doctor's Best · Amazon.com · 🌾 Vitamin B1
CPS
Price
$42.99
Doctor's Best · Amazon.com · 🌾 Vitamin B1
CPS
Price
$19.99
Amazon.com · 🌾 Vitamin B1
CPS
Price
$9.29
Amazon.com · 🌾 Vitamin B1
CPS
Price
$23.95
NatureBell · Amazon.com · 🌾 Vitamin B1
CPS
Price
$19.99
Life Extension · Amazon.com · 🌾 Vitamin B1
CPS
Price
$23.00
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.
BulkSupplements.com Thiamine Mononitrate Powder - Vitamin B1 Powder at $0.02 per serving — the lowest cost-per-dose vitamin b1 in our catalog. See the full ranking on the Best Vitamin B1 page.
We're tracking 68 active Vitamin B1 deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
Across 54 tracked Vitamin B1 deals the median cost-per-dose is $0.150; the cheapest quartile comes in under $0.084 per serving. 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 Tolerable Upper Intake Level (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.
Dosage, upper-limit, deficiency, food-source and interaction facts are sourced from the NIH Office of Dietary Supplements Vitamin B1 fact sheet. General information, not medical advice.
240 servings · ~240-day supply
$0.03
800 servings · ~800-day supply
2000 servings · ~2000-day supply
360 servings · ~360-day supply
120 servings · ~120-day supply
