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Folic Acid (Vitamin B9) – Cell Division, DNA, and Pregnancy
Folic acid is the synthetic counterpart to naturally occurring folates and belongs to the group of B vitamins. Without sufficient folate, DNA cannot be replicated and repaired – this is particularly critical during phases of rapid cell division such as pregnancy, growth, and sports.
Biochemistry: How Folate Works in the Body
Folate compounds act as coenzymes in what is known as one-carbon metabolism (C1 metabolism). They transfer C1 units between molecules – crucial for:
- DNA Synthesis: Provision of thymidylate (dTMP) for DNA replication (via thymidylate synthase)
- Purine Biosynthesis: Formation of adenine and guanine (DNA/RNA building blocks)
- Homocysteine Remethylation: Folate (as 5-MTHF) + Vitamin B12 methylate homocysteine to methionine → protects the cardiovascular system
- Epigenetic Methylation: Methionine is a precursor to SAM (S-adenosylmethionine), the universal methyl group donor
- Amino Acid Metabolism: Glycine-serine interconversion, histidine degradation
Folic Acid vs. Folate vs. 5-MTHF
| Form | Properties | Recommendation |
|---|---|---|
| Folate (natural) | In foods, unstable, polyglutamate form | Aim for through diet |
| Folic Acid (synthetic) | Stable, must first be converted to active 5-MTHF | Standard in supplements |
| 5-MTHF (Methylfolate) | Already active form, no MTHFR enzyme needed | Preferred for MTHFR polymorphism |
MTHFR Gene Variant
The MTHFR enzyme (methylenetetrahydrofolate reductase) converts folic acid to the active form 5-MTHF. About 10–15% of the population carry the C677T variant (homozygous), which reduces enzyme activity by up to 70%. These individuals benefit greatly from 5-MTHF instead of folic acid.
Daily Requirement and Critical Life Stages
| Group | Recommendation | Reason |
|---|---|---|
| General Population | 300 µg DFE/day | Basic requirement for cell division/DNA |
| Women Planning Pregnancy | +400 µg Folic Acid/day | Neural tube defect prevention, starting 4 weeks before conception |
| Pregnant Women | 550 µg DFE/day | Fetal organ and CNS development |
| Breastfeeding Women | 450 µg DFE/day | Increased demand due to breast milk |
| Athletes (intense) | 400–600 µg DFE/day | Increased cell regeneration rate |
DFE = Dietary Folate Equivalents: 1 µg DFE = 1 µg dietary folate = 0.5 µg folic acid (fasting) = 0.6 µg folic acid (with meal)
Folate-Rich Foods
| Food | Folate µg/100g |
|---|---|
| Yeast (dry) | 2,840 µg |
| Veal Liver | 590 µg |
| Black-eyed Peas (cooked) | 256 µg |
| Edamame | 311 µg |
| Spinach (raw) | 194 µg |
| Broccoli | 90 µg |
Important: Folate is extremely sensitive to heat and light. Cooking destroys up to 70% of folate compounds. Prefer raw, gently prepared vegetable dishes.
Folate Deficiency: Symptoms and Risk Groups
Typical symptoms of deficiency: Megaloblastic anemia (large, immature red blood cells), fatigue, elevated homocysteine levels, angular cheilitis, poor concentration, depression.
Risk groups: Pregnant women, heavy alcohol consumers (alcohol inhibits folate absorption), methotrexate users (folate antagonist), people with malabsorption syndromes, vegans (with an unbalanced diet), MTHFR gene carriers.
Frequently Asked Questions (FAQ)
Why is folic acid recommended before pregnancy?
The neural tube closes in the 4th week of pregnancy – often before the woman knows she is pregnant. Therefore: start supplementation 4–8 weeks before planned conception.
Is there an upper limit for folic acid?
The EFSA sets the upper tolerable limit for folic acid (synthetic) at 1,000 µg/day. Dietary folate has no defined UL. High doses of folic acid can mask a vitamin B12 deficiency.
How do folic acid and methylfolate differ in practice?
Methylfolate (5-MTHF) is directly active – no MTHFR enzyme is needed. In cases of MTHFR polymorphism, or if homocysteine levels remain elevated despite folic acid intake, 5-MTHF is the better choice.
