Folic Acid + Vitamin K2 — Supplement Stacking Guide
Found together in 3 real supplement products in our database
What Each Ingredient Does
Our database of real supplement products shows that Folic Acid and Vitamin K2 appear together in 3 products, making this one of the more common pairings among supplement formulators. The evidence and dosing guidance below apply to each ingredient independently.
Folic Acid
Preferred form: Folic Acid (S4 bioavailability)
Synthetic folic acid is more bioavailable than natural food folate: in a 4-week 13C-labeled randomized intervention (n=72), the aggregate bioavailability of food folate was approximately 80% that of folic acid. This bioavailability gap underlies the Dietary Folate Equivalents (DFE) conversion used on supplement labels. PubMed
Vitamin K2
Preferred form: Vitamin K2 (as MK-7) (S1 bioavailability)
May support: healthy calcium metabolism and bone mineral density, cardiovascular health by directing calcium away from arterial walls, healthy blood clotting cascade.
Crossover RCT (n=5 healthy women): single dose MK-4 (420μg) was undetectable in serum at all time points; MK-7 (420μg) reached peak serum concentration at 6 hours and was detectable up to 48 hours post-intake. Consecutive daily MK-7 produced significant cumulative serum accumulation; MK-4 showed none. PubMed
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Frequently Asked Questions
What is the best form of Folic Acid?
Folic Acid is the Mapped Form form of Folic Acid in the FormulaForge formulary, reflecting research-backed evidence for superior bioavailability (low). This classification is based on published absorption studies and peer-reviewed bioavailability data. The best form for you depends on your individual health goals and your healthcare provider's recommendations. Always consult a qualified healthcare provider before starting, stopping, or adjusting any supplement regimen.
What are the benefits of Folic Acid?
**Folic acid** (vitamin B9) supplementation has well-established clinical benefits, safety profile, dosing guidelines, and bioavailability characteristics supported by extensive research, including recent studies up to 2023-2024. These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.
What is the best form of Vitamin K2?
Vitamin K2 (as MK-7) is the Preferred Form form of Vitamin K2 in the FormulaForge formulary, reflecting research-backed evidence for superior bioavailability (high). This classification is based on published absorption studies and peer-reviewed bioavailability data. The best form for you depends on your individual health goals and your healthcare provider's recommendations. Always consult a qualified healthcare provider before starting, stopping, or adjusting any supplement regimen.
What are the benefits of Vitamin K2?
Vitamin K2 has been studied for its role in supporting: Supports healthy calcium metabolism and bone mineral density, Supports cardiovascular health by directing calcium away from arterial walls, Supports healthy blood clotting cascade, Synergizes with vitamin D3 for optimal calcium utilization. MK-7 (menaquinone-7) demonstrates superior bioavailability and tissue distribution compared to MK-4 and K1 (phylloquinone). MK-4 is largely undetectable in serum at nutritional doses; MK-7 shows robust serum levels peaking at 6 hours and detectable up to 48-96 hours. During prolonged use, MK-7 accumulates 7-8 fold higher than K1, and its long circulating half-life enables redistribution to extrahepatic tissues including bone and vasculature — advantages not shared by K1 which is hepatically retained. These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.
Can you take Folic Acid and Vitamin K2 at the same time?
Folic Acid and Vitamin K2 appear together in 3 products in our database of real supplement formulas. That reflects a common formulator pairing — it is not, by itself, evidence that combining them produces an additive or synergistic effect beyond what each ingredient contributes independently. As with any supplement regimen, consult a qualified healthcare provider to confirm the combination is appropriate for your individual health needs.
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- Synthetic folic acid is more bioavailable than natural food folate: in a 4-week 13C-labeled randomized intervention (n=72), the aggregate bioavailability of food folate was approximately 80% that of folic acid. This bioavailability gap underlies the Dietary Folate Equivalents (DFE) conversion used on supplement labels. PubMed DOI
- In a controlled 30-day intervention (n=96), natural food folates were significantly less bioavailable than folic acid (30% for spinach to 59% for yeast), and the relative-bioavailability estimates were consistent with those used to derive the US Dietary Folate Equivalents (DFE) value. PubMed DOI
- Comparable physiological activity at equimolar doses, but 5-MTHF shows 1.64x higher AUC for total folate PubMed
- Crossover RCT (n=5 healthy women): single dose MK-4 (420μg) was undetectable in serum at all time points; MK-7 (420μg) reached peak serum concentration at 6 hours and was detectable up to 48 hours post-intake. Consecutive daily MK-7 produced significant cumulative serum accumulation; MK-4 showed none. PubMed
- Healthy volunteers: natto-derived MK-7 accumulated 7-8 fold higher serum levels than synthetic vitamin K1 (phylloquinone) during prolonged supplementation. MK-7 induced more complete carboxylation of osteocalcin (extrahepatic tissue marker) vs K1. Both absorbed with peak at 4 hours; MK-7 sustained versus K1 rapid decline. PubMed
- Review: Postprandial serum MK-7 concentrations reported 10-fold higher than K1 (phylloquinone). K1 primarily retained in liver for coagulation; MK-7 redistributes to extrahepatic tissues (bone, vasculature) due to longer circulating half-life. Long-chain menaquinones detectable up to 96 hours vs 8-24 hours for K1. PubMed
This information is educational and not a substitute for professional medical advice. Consult your physician before making supplement decisions.
FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.