NEW
🍎 Apple cider vinegar
Cost per serving
$0.38
60 servings · ~60-day supply
vitamin · 135 active deals
The best-value Vitamin B9 right now is about $0.01 per dose — across 86 tracked products the median is $0.161/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Vitamin B9 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 B9 catalog is at $0.01 per serving.
Recommended daily intake
Upper limit applies to synthetic folic acid; expressed as mcg DFE. General FDA/NIH adult guidance — not medical advice.
Folate is a water-soluble B vitamin (sometimes called vitamin B9) that functions as a coenzyme or cosubstrate in single-carbon transfers, where it is required for the synthesis of nucleic acids (DNA and RNA) and the metabolism of amino acids; it is involved in converting homocysteine to methionine and in the methylation of deoxyuridylate to thymidylate, a reaction needed for proper cell division. Researchers have studied folate's possible role in several conditions, including autism spectrum disorder, cancer, cardiovascular disease and stroke, dementia and cognitive function, depression, neural tube defects, and preterm birth and other congenital anomalies, but the evidence is largely mixed, observational, or inconclusive. The available evidence suggests that supplementation appears to reduce the risk of stroke, especially in populations with low folate status, while trials generally have not shown that folic acid supplements reduce other cardiovascular events, overall cancer risk, or cognitive decline, and some studies have raised concerns that high folic acid doses taken after preneoplastic lesions are established could promote cancer development. Adequate maternal folate intake is associated with reduced risk of neural tube defects, though firm causal conclusions for most other outcomes require more research — per the NIH Office of Dietary Supplements; not medical advice.
The fact sheet describes three main forms: naturally occurring food folates (in the tetrahydrofolate, or THF, polyglutamate form), folic acid (the fully oxidized monoglutamate form used in fortified foods and most dietary supplements), and 5-MTHF (also called L-methylfolate or methylfolate), found in some supplements. The sheet states that about 85% of supplemental folic acid is bioavailable when taken with food and nearly 100% when taken without food, whereas only about 50% of folate naturally present in food is bioavailable. It notes that the bioavailability of 5-MTHF in supplements is the same as or greater than that of folic acid, although formal conversion factors for 5-MTHF have not been established.
Folate is naturally present in a wide variety of foods, including vegetables (especially dark green leafy vegetables), fruits and fruit juices, nuts, beans, peas, seafood, eggs, dairy products, meat, poultry, and grains. Spinach, liver, asparagus, and brussels sprouts are among the foods with the highest folate levels. Because cereals and grains are widely consumed in the United States and are fortified with folic acid, they have become important contributors of folic acid to the American diet — per the NIH Office of Dietary Supplements.
Every Vitamin B9 deal above is ranked by real cost per dose with no paid placement — see our and .
1 of 23 tracked Vitamin B9 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 is 400 mcg DFE/day for males and females age 19+ (and 14-18). Children: 65 mcg AI (0-6 months), 80 mcg (7-12 months), 150 mcg (1-3), 200 mcg (4-8), 300 mcg (9-13). Pregnancy is 600 mcg DFE and lactation 500 mcg DFE. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Yes. The for adults 19+ is 1,000 mcg/day of folic acid from supplements or fortified foods (lower for children). High folate can correct the anemia but not the neurological damage of vitamin B12 deficiency, potentially masking it. No UL was set for folate from food. — per the NIH Office of Dietary Supplements; general information, not medical advice.
The primary sign is megaloblastic anemia, with weakness, fatigue, difficulty concentrating, irritability, headache, heart palpitations, and shortness of breath. Deficiency can also cause soreness and shallow ulcerations on the tongue and oral mucosa; changes in skin, hair, or fingernail pigmentation; gastrointestinal symptoms; and elevated blood homocysteine. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Groups at risk of inadequacy include people with alcohol use disorder, women of childbearing age, pregnant women, people with malabsorptive disorders (such as tropical sprue, celiac disease, and inflammatory bowel disease), and people with an MTHFR 677C>T polymorphism. — 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.
Isolated folate deficiency is uncommon and usually coexists with other nutrient deficiencies because of its strong association with poor diet, alcoholism, and malabsorptive disorders; its primary clinical sign is megaloblastic anemia (large, abnormally nucleated erythrocytes), with symptoms such as weakness, fatigue, difficulty concentrating, headache, heart palpitations, and shortness of breath. Groups most likely to be at risk of inadequacy include people with alcohol use disorder, women of childbearing age, pregnant women, people with malabsorptive disorders, and those with an MTHFR polymorphism. Women with insufficient folate intakes are at increased risk of giving birth to infants with neural tube defects — per the NIH Office of Dietary Supplements.
Some population groups are at risk of obtaining excessive folic acid, primarily from dietary supplements; for example, about 5% of men and women age 51–70 and men age 71 and older have folic acid intakes exceeding the UL of 1,000 mcg per day, and many children exceed the lower UL of 300–600 mcg per day. Little is known about the long-term effects of high folic acid doses in children — per the NIH Office of Dietary Supplements.
Cost per serving
$0.38
60 servings · ~60-day supply
Cost per serving
$0.17
Avg·−49%120 servings · ~120-day supply
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$0.17
120 servings · ~120-day supply
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$0.17
120 servings · ~120-day supply
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$0.08
480 servings · ~480-day supply
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120 servings · ~120-day supply
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$0.19
180 servings · ~180-day supply
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$0.17
60 servings · ~60-day supply
Cost per serving
$0.31
50 servings · ~50-day supply
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$0.25
120 servings · ~120-day supply
Cost per serving
$0.06
180 servings · ~180-day supply
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$0.50
60 servings · ~60-day supply
Cost per serving
$0.19
70 servings · ~70-day supply
Cost per serving
$0.17
60 servings · ~60-day supply
Cost per serving
$0.12
Avg·−59%120 servings · ~120-day supply
Cost per serving
$0.27
60 servings · ~60-day supply
Cost per serving
$0.42
Pricey60 servings · ~60-day supply
Cost per serving
$0.28
60 servings · ~60-day supply
Cost per serving
$0.27
Avg·−35%Cost per serving
$0.07
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$0.26
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$0.30
90 servings · ~90-day supply
Cost per serving
$0.08
Avg·−70%120 servings · ~120-day supply
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$0.27
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$0.15
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60 servings · ~60-day supply
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$0.33
60 servings · ~60-day supply
Cost per serving
$0.17
120 servings · ~120-day supply
Cost per serving
$0.32
120 servings · ~120-day supply
Cost per serving
$0.16
Avg·−51%120 servings · ~120-day supply
Cost per serving
$0.33
AvgCost per serving
$0.25
Avg·−37%60 servings · ~60-day supply
Cost per serving
$0.89
Pricey90 servings · ~90-day supply
Cost per serving
$0.95
Pricey60 servings · ~60-day supply
Cost per serving
$0.28
Avg·−33%90 servings · ~90-day supply
Cost per serving
$0.98
90 servings · ~90-day supply
Cost per serving
$0.10
240 servings · ~240-day supply
Cost per serving
$1.00
Pricey30 servings · ~30-day supply
Cost per serving
$0.32
Avg60 servings · ~60-day supply
Cost per serving
$0.83
Pricey90 servings · ~90-day supply
Cost per serving
$0.60
30 servings · ~30-day supply
Cost per serving
$0.95
Pricey60 servings · ~60-day supply
Cost per serving
$0.03
Cheap·−88%500 servings · ~500-day supply
Cost per serving
$0.02
Cheap·−92%250 servings · ~250-day supply
Cost per serving
$0.04
300 servings · ~300-day supply
Cost per serving
$0.57
30 servings · ~30-day supply
Cost per serving
$0.04
Cheap·−85%250 servings · ~250-day supply
Cost per serving
$0.12
90 servings · ~90-day supply
Cost per serving
$0.01
Cheap·−95%400 servings · ~400-day supply
Cost per serving
$0.02
Cheap·−91%250 servings · ~250-day supply
Cost per serving
$0.03
Cheap·−88%500 servings · ~500-day supply
Cost per serving
$0.33
AvgCost per serving
$0.02
Cheap·−92%500 servings · ~500-day supply
Cost per serving
$0.04
Cheap·−85%240 servings · ~240-day supply
Cost per serving
$0.14
100 servings · ~100-day supply
Cost per serving
$0.06
Avg·−74%250 servings · ~250-day supply
Cost per serving
$0.68
Pricey30 servings · ~30-day supply
Cost per serving
$0.19
Avg·−46%120 servings · ~120-day supply
Cost per serving
$0.22
Avg·−42%60 servings · ~60-day supply
Cost per serving
$0.13
100 servings · ~100-day supply
Cost per serving
$0.05
Cheap·−81%400 servings · ~400-day supply
Cost per serving
$0.17
Avg·−49%60 servings · ~60-day supply
Cost per serving
$0.05
250 servings · ~250-day supply
Cost per serving
$0.04
Cheap·−83%400 servings · ~400-day supply
Cost per serving
$0.21
90 servings · ~90-day supply
Cost per serving
$0.06
100 servings · ~100-day supply
Cost per serving
$0.16
60 servings · ~60-day supply
Cost per serving
$0.05
250 servings · ~250-day supply
Cost per serving
$0.22
90 servings · ~90-day supply
Cost per serving
$0.39
60 servings · ~60-day supply
Cost per serving
$0.06
240 servings · ~240-day supply
Cost per serving
$0.22
120 servings · ~120-day supply
Cost per serving
$0.21
120 servings · ~120-day supply
Cost per serving
$0.34
70 servings · ~70-day supply
Cost per serving
$0.15
60 servings · ~60-day supply
Cost per serving
$0.16
60 servings · ~60-day supply
Cost per serving
$0.42
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
$0.57
60 servings · ~60-day supply
Cost per serving
$0.10
60 servings · ~60-day supply
Cost per serving
$0.28
150 servings · ~150-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
$0.18
180 servings · ~180-day supply
Cost per serving
$0.21
60 servings · ~60-day supply
Cost per serving
$0.12
150 servings · ~150-day supply
Cost per serving
$0.06
150 servings · ~150-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
Cost per serving
$0.48
60 servings · ~60-day supply
Cost per serving
$0.10
240 servings · ~240-day supply
Amazon.com · 🍎 Apple cider vinegar
CPS
Price
$23.00
SuperSmart USA LLC · SuperSmart · 🌿 Vitamin B9
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$20.00
Amazon.com · 🅱️ B-Complex
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$19.95
Amazon.com · 🅱️ B-Complex
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$19.89
Micro Ingredients · Amazon.com · 🅱️ B-Complex
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$39.99
Vykee Nutrition · Amazon.com · 🅱️ B-Complex
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$15.60
Amazon.com · 🅱️ B-Complex
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$29.59
Carlyle · Amazon.com · 🅱️ B-Complex
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$9.99
Amazon.com · 🅱️ B-Complex
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$29.95
Amazon.com · 🅱️ B-Complex
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$13.49
Amazon.com · 💉 Methylcobalamin
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$9.99
Amazon.com · 🌿 Vitamin B9
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$14.80
Bluebonnet · Amazon.com · 🤰 Prenatal Vitamin
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Amazon.com · 🌿 Vitamin B9
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$25.00
Amazon.com · 🤰 Prenatal Vitamin
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Superior Source · Amazon.com · 🌿 Vitamin B9
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Carlyle · Amazon.com · 🌿 Vitamin B9
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Jarrow Formulas · Amazon.com · 🌿 Vitamin B9
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Amazon.com · 🌿 Vitamin B9
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$9.95
Amazon.com · 🌿 Vitamin B9
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$24.00
NOW Foods · Amazon.com · 🌿 Vitamin B9
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Amazon.com · 💉 Methylcobalamin
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$19.99
Amazon.com · 💉 Methylcobalamin
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$37.99
Horbäach · Amazon.com · 🌿 Vitamin B9
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Amazon.com · 🌿 Vitamin B9
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Nature's Truth · Amazon.com · 🌿 Vitamin B9
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Amazon.com · 🌿 Vitamin B9
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Carlyle · Amazon.com · 🌿 Vitamin B9
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$88.00
NatureBell · Amazon.com · 💉 Methylcobalamin
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$22.99
Amazon.com · 🌿 Vitamin B9
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$30.00
Carlyle · Amazon.com · 🌿 Vitamin B9
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$18.99
Amazon.com · 🌿 Vitamin B9
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$75.00
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$17.95
Amazon.com · 🌿 Vitamin B9
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$57.00
Amazing Formulas · Amazon.com · 🌿 Vitamin B9
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$14.99
Piping Rock · Amazon.com · 🌿 Vitamin B9
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Carlson · Amazon.com · 🤰 Prenatal Vitamin
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Amazon.com · 🤰 Prenatal Vitamin
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Amazing Formulas · Amazon.com · 🌿 Vitamin B9
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Bluebonnet · Amazon.com · 🤰 Prenatal Vitamin
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Carlyle · Amazon.com · 🌿 Vitamin B9
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21st Century · Amazon.com · 🌿 Vitamin B9
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Vitamatic · Amazon.com · 🌿 Vitamin B9
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Amazon.com · 🌿 Vitamin B9
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Amazon.com · 🌿 Vitamin B9
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Solgar · Amazon.com · 🤰 Prenatal Vitamin
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Amazon.com · 🌿 Vitamin B9
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$16.99
Amazon.com · 💉 Methylcobalamin
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$18.99
NOW Foods · Amazon.com · ⚡ Vitamin B12
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NOW Foods · Amazon.com · ⚡ Vitamin B12
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Amazon.com · ⚡ Vitamin B12
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$13.44
Vitamatic · Amazon.com · ⚡ Vitamin B12
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$19.99
Amazon.com · ⚡ Vitamin B12
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$23.49
Vitamatic · Amazon.com · 💉 Methylcobalamin
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Amazon.com · 🅱️ B-Complex
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Amazon.com · 🅱️ B-Complex
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$8.99
Amazon.com · 🅱️ B-Complex
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$9.82
Amazon.com · 🅱️ B-Complex
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$24.95
Amazon.com · 🅱️ B-Complex
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$33.79
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NatureWise · Amazon.com · 🅱️ B-Complex
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$5.98
Nature's Bounty · Amazon.com · 🅱️ B-Complex
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Bronson · Amazon.com · 🅱️ B-Complex
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Bronson · Amazon.com · 🅱️ B-Complex
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Bronson · Amazon.com · 🅱️ B-Complex
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Amazon.com · 🅱️ B-Complex
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$32.95
Amazon.com · 🅱️ B-Complex
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Nature's Bounty · Amazon.com · 🅱️ B-Complex
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$18.33
NatureWise · Amazon.com · 🅱️ B-Complex
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Micro Ingredients · Amazon.com · 🅱️ B-Complex
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$26.95
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$22.95
Nature Made · Amazon.com · 🅱️ B-Complex
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Amazon.com · 🍵 L-Theanine
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Micro Ingredients · Amazon.com · 🧠 Choline
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Yes. Folate can interact with methotrexate (a folate antagonist used for cancer and autoimmune diseases); antiepileptic medications such as phenytoin, carbamazepine, and valproate; and sulfasalazine, which inhibits folate absorption. People taking these regularly should discuss folate intake with their health care providers. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Carlyle Folic Acid 400 mcg | 400 Tablets | Vegetarian at $0.01 per serving — the lowest cost-per-dose vitamin b9 in our catalog. See the full ranking on the Best Vitamin B9 page.
We're tracking 135 active Vitamin B9 deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
Across 86 tracked Vitamin B9 deals the median cost-per-dose is $0.161; the cheapest quartile comes in under $0.061 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.
Some population groups are at risk of obtaining excessive folic acid, primarily from dietary supplements; for example, about 5% of men and women age 51–70 and men age 71 and older have folic acid intakes exceeding the UL of 1,000 mcg per day, and many children exceed the lower UL of 300–600 mcg per day. Little is known about the long-term effects of high folic acid doses in children — per the NIH Office of Dietary Supplements.
Isolated folate deficiency is uncommon and usually coexists with other nutrient deficiencies because of its strong association with poor diet, alcoholism, and malabsorptive disorders; its primary clinical sign is megaloblastic anemia (large, abnormally nucleated erythrocytes), with symptoms such as weakness, fatigue, difficulty concentrating, headache, heart palpitations, and shortness of breath. Groups most likely to be at risk of inadequacy include people with alcohol use disorder, women of childbearing age, pregnant women, people with malabsorptive disorders, and those with an MTHFR polymorphism. Women with insufficient folate intakes are at increased risk of giving birth to infants with neural tube defects — per the NIH Office of Dietary Supplements.
Folate is naturally present in a wide variety of foods, including vegetables (especially dark green leafy vegetables), fruits and fruit juices, nuts, beans, peas, seafood, eggs, dairy products, meat, poultry, and grains. Spinach, liver, asparagus, and brussels sprouts are among the foods with the highest folate levels. Because cereals and grains are widely consumed in the United States and are fortified with folic acid, they have become important contributors of folic acid to the American diet — 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 B9 fact sheet. General information, not medical advice.
60 servings · ~60-day supply
120 servings · ~120-day supply
60 servings · ~60-day supply
$0.07
360 servings · ~360-day supply
