Vitamin B9 (Folic Acid) vs Folate (5-MTHF)
Two forms of the same compound. What differs is how much of it your body absorbs, how well you tolerate it and what it costs per month.
Side by side
Green marks the better value| Vitamin B9 (Folic Acid) | Folate (5-MTHF) | |
|---|---|---|
| Absorption score | 85/100 | 95/100 |
| Cost per 10 mg delivered | $3.27 | $11.7 |
| Safety rating | 8/10 | 9/10 |
| Cost per month | $5 | $20 |
| Daily dose | 400-800 mcg | 400-800 mcg |
| Best timing | Morning with food | Morning with food |
| Evidence level | A | A |
Verdict
Too close to call on the numbers.
Both forms score the same on the measurable metrics. Pick by tolerance and price.
What actually differs
Vitamin B9 (Folic Acid)
Synthetic form of folate used in supplements and fortified foods, requiring conversion to active forms
- Most research
- Least expensive
- Very stable
- High absorption
- Requires conversion
- May accumulate unmetabolized
- Not ideal for MTHFR variants
Folate (5-MTHF)
Active form of folate essential for DNA synthesis, methylation, and fetal neural tube development
- Active form
- Bypasses MTHFR
- Best for gene variants
- Most expensive
- Less stable
- Limited long-term research
What helps
Vitamin B9 (Folic Acid) → Folate (5-MTHF)
Complementary roles in one-carbon metabolism · level AVitamin B9 (Folic Acid) → Folate (5-MTHF)
Sequential steps in methylation pathway · level AVitamin B9 (Folic Acid) → Folate (5-MTHF)
Antioxidant protection and folate regeneration · level BFolate (5-MTHF) → Vitamin B9 (Folic Acid)
Complementary roles in one-carbon metabolism · level AFolate (5-MTHF) → Vitamin B9 (Folic Acid)
Sequential steps in methylation pathway · level AFolate (5-MTHF) → Vitamin B9 (Folic Acid)
Antioxidant protection and folate regeneration · level BWhat each form is for
Same compound, but the dose, the ceiling and the record differVitamin B9 (Folic Acid) — dna synthesis & pregnancy support.
Usual daily dose 400-800 mcg, taken morning with food. The ceiling is 1000 mcg a day (NIH ODS). Evidence grade A.
Folate (5-MTHF) — dna synthesis & fetal development.
Usual daily dose 400-800 mcg, taken morning with food. The ceiling is 1000 mcg a day (NIH ODS). It is named as the suspect product in 14 FDA reports. Evidence grade A.
How these numbers are read
- The absorption score ranks forms of the same compound against each other. It is not a measured share of the dose — see how we derive it.
- Safety rating reflects tolerance at normal doses, not toxicity risk.
- Cost is per month at the typical daily dose, so a cheaper form taken at double the dose is not cheaper.
- Evidence level A means the form itself was studied, not just the parent compound.
Where to buy
Both forms deliver the same compound — pick by the numbers above, then check the label matches.
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Common questions
Which is better, Vitamin B9 (Folic Acid) or Folate (5-MTHF)?
Folate (5-MTHF) absorbs better — 95% against 85%. Absorption decides how much of the dose actually reaches you, so it usually matters more than the milligrams printed on the label.
What is the difference between Vitamin B9 (Folic Acid) and Folate (5-MTHF)?
Both deliver the same active compound. They differ in how well the body takes them up, how they are tolerated and what a month costs: $5 against $20.
Can you take Vitamin B9 (Folic Acid) and Folate (5-MTHF) together?
You can, but there is rarely a reason to. Two forms of the same compound stack the same active dose, so the usual approach is to pick the better absorbed one and dose it properly.