Best Form of Vitamin K1 (2026)

All Forms Ranked

1stSecondaryS2

Vitamin K1

Form: Phylloquinone

Why this form is preferred:Vitamin K1 (phylloquinone) is the dietary form of vitamin K found in green leafy vegetables that primarily supports hepatic coagulation factor synthesis. Research supports vitamin K1 for promoting healthy blood coagulation protein activation and bone osteocalcin activity, serving as a foundational K vitamin alongside K2 forms.

Why Vitamin K1 Form Matters

Not all forms of Vitamin K1 are created equal. There are 1 forms available in our database. All available forms are classified at the same formulary tier, though individual bioavailability data may still vary.

Choosing the right form means getting more benefit from every dose. FormulaForge uses proprietary bioavailability data to rank forms and recommend the most effective options for each individual.

Our Rankings

Forms are ranked by formulary tier, which reflects relative bioavailability and clinical evidence quality. Lower tier number = higher preference.

#1 — Vitamin K1 (T2 Specialist): bioavailability rated good (S2), typical dose range not yet documented in our database.

How We Evaluate Forms

FormulaForge classifies supplement forms using a four-tier system based on published bioavailability research:

T1 Preferred — Highest bioavailability tier (S1), strongest clinical evidence for efficient absorption.
T2 Specialist — High to good bioavailability (S1–S2), appropriate for specific therapeutic goals or population needs.
T3 Customer Choice — Moderate to lower bioavailability; included because customer demand warrants availability.
T4 Mapped — Mapped to a T1 or T2 preferred form; dose is automatically adjusted for equivalent effect.

Each form’s bioavailability tier (S1–S4) is determined from published absorption studies. We do not expose raw dose conversion ratios or proprietary calculation methodology in public-facing content.

Frequently Asked Questions

What is the best form of Vitamin K1?

Vitamin K1 is the T2 Specialist form of Vitamin K1 based on FormulaForge's research-backed formulary assessment. It carries a bioavailability rating of good (S2), indicating superior absorption compared to lower-tier forms. Always consult a qualified healthcare provider before starting, stopping, or adjusting any supplement regimen.

Why does the form of Vitamin K1 matter?

Different chemical forms of Vitamin K1 can vary in how well they are absorbed and used by the body. Our formulary lists 1 form of Vitamin K1. FormulaForge uses published bioavailability research to classify forms and recommend the most effective options.

How do I choose the right Vitamin K1 supplement?

Choosing the right Vitamin K1 supplement depends on your specific health goals, budget, and any existing conditions or medications. Start by comparing formulary tiers — T1 Preferred forms reflect the strongest bioavailability evidence. Review dose ranges documented for each form, and confirm the choice with your healthcare provider. Always consult a qualified healthcare provider before starting, stopping, or adjusting any supplement regimen.

Is Phylloquinone worth the extra cost?

Vitamin K1 is classified as T2 Specialist with a bioavailability rating of good (S2). Higher-tier forms may cost more because of the research and manufacturing processes required to achieve better absorption. Whether that trade-off is worthwhile depends on your individual goals, budget, and healthcare provider's advice.

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.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.