Within Vitamin K, this term helps answer a practical question: Is the Vitamin K ingredient specifically identified as Vitamin K1, phylloquinone, or phytonadione?
Someone may explore this term when classifying Vitamin K1 in a standalone product, fortified food, or broader formulation. It provides the precise ingredient identity before considering Vitamin K2, specific menaquinone forms such as MK-4 or MK-7, generic Vitamin K references, finished products, formulation structures, delivery formats, or Educational Contexts associated with Vitamin K.
Why this ingredient matters
Vitamin K includes Vitamin K1 and the Vitamin K2 menaquinone family. Identifying Vitamin K1 separately helps prevent phylloquinone (phytonadione) from being grouped under the broad Vitamin K when the exact form is known.
Vitamin K1 serves as the specific ingredient term when the label uses Vitamin K1, phylloquinone, or phytonadione. It remains distinct from the menaquinone forms organized beneath Vitamin K2.
This classification does not determine whether Vitamin K1 is preferable, more suitable, or more appropriate than a Vitamin K2 form. Ingredient identity, source, dose, formulation, intended use, and individual circumstances must be evaluated separately.
How Vitamin K1 fits within Nutrient Families & Ingredients
Vitamin K1 is a concept term beneath Vitamin K, the nutrient family that organizes Vitamin K1 and the Vitamin K2 menaquinone family.
Within that family, Vitamin K1 identifies phylloquinone or phytonadione specifically. It should be mapped directly whenever the ingredient label provides that level of detail.
This term should not be used for Vitamin K2, MK-4, MK-7, or generic Vitamin K references when the specific form is unknown.
What belongs here
- Vitamin K1 listed as the Vitamin K ingredient
- Phylloquinone listed on an ingredient or supplement facts panel
- Phytonadione listed as a Vitamin K ingredient
- Standalone products that specifically contain Vitamin K1
- Fortified foods that identify phylloquinone or phytonadione
- Broader formulations that specifically include Vitamin K1
What does not belong here
Do not use this term for Vitamin K2 or the menaquinone family.
Do not use this term for MK-4, MK-7, or other specific Vitamin K2 forms.
Do not use this term for broad Vitamin K references when the label does not identify the form.
Finished products, formulation structures, delivery formats, and health topics associated with Vitamin K should be classified in their appropriate dimensions.
Common areas of overlap
Vitamin K1 overlaps most closely with the broader Vitamin K family. Use Vitamin K1 when the ingredient form is explicitly identified as Vitamin K1, phylloquinone, or phytonadione. Use Vitamin K when the exact form is unknown or family-level mapping is sufficient.
It also overlaps with Vitamin K2. Both belong within the broader Vitamin K family, but Vitamin K1 is a specific form while Vitamin K2 is a family of menaquinone forms.
The term may overlap with Supplement Categories and Formulation Structures when Vitamin K1 appears in a standalone supplement, multivitamin, or broader nutrient formula. Those classifications should be mapped separately from ingredient identity.
Educational Contexts may explain why Vitamin K1 is discussed in relation to circulation, bone health, or other topics. Those contexts do not change the ingredient classification.
A practical example
A supplement facts panel lists Vitamin K as phytonadione. The ingredient should be mapped directly to Vitamin K1 because phytonadione identifies the specific K1 form.
If another product lists only Vitamin K without naming phylloquinone, phytonadione, or a menaquinone form, the broader Vitamin K term should be used instead.
How to use this reference page
Use this page when classifying or explaining Vitamin K specifically identified as Vitamin K1, phylloquinone, or phytonadione.
When reviewing a possible use, ask whether the label names Vitamin K1, phylloquinone, phytonadione, Vitamin K2, MK-4, MK-7, or only generic Vitamin K. Use Vitamin K1 only when the specific K1 form is identified.
This page supports consistent classification within the Supplement Education Model. It is a reference for organizing nutrient and ingredient identity and does not determine whether a Vitamin K1 dose, formulation, combination, or product is appropriate for any individual.
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