Vitamin K2 MK-7 Price Guide: Per-Mcg Math

Vitamin K2 is the smallest number on any label in the store. The doses are measured in micrograms — a hundred millionths of a kilogram — and the shelf answers with the biggest spread of forms and claims this series has seen: menaquinone-7 from synthetic baths, menaquinone-7 fermented in natto, menaquinone-4 at fifteen milligrams a capsule, and bottles that pair the K2 with vitamin D3 so tightly that the price can no longer be split. The name on the front almost never tells you which of these you are holding. This guide puts the single-ingredient shelf on one ruler: the dollar cost of 100 micrograms of vitamin K2, computed from live prices and the Supplement Facts panels behind every row.

We pulled 889 K2 listings with a live price on supplement.deals on October 23, 2026. Thirty-five carried a counted format and a dose figure in the name, and we clicked through to 24 retailer pages. Twenty-three panels were readable on the first or second pass, one listing was out of stock at its retailer with a panel printed only on a label image, and nineteen bottles survived as verified single-ingredient rows — seventeen of them menaquinone-7, two of them the menaquinone-4 form that two plain-named bottles turned out to contain. Those exclusions, and a D3-paired shelf we priced out of the math on principle, are named at the end.

Corrected rate = price divided by (servings per container times panel micrograms per serving), stated as the cost of 100 mcg of K2. The panel, not the name, decides the per-serving figure — and on this shelf the panel sometimes decides the form, too.

How we priced the shelf

Every row below is priced the same way: servings per container times panel micrograms per serving, divided into the price and restated per 100 mcg. One microgram is one one-thousandth of a milligram, so a 100 mcg capsule is 0.1 mg — we keep the microgram spelling throughout because that is what every panel in this aisle prints, and the per-100-mcg rate is simply ten times the per-milligram rate for readers who want the conversion. A dose of 100 mcg a day is the most common single-capsule figure on the shelf, which is why the ruler is set there: the rate tells you what a standard-strength day costs from any bottle, whatever its count and whatever its strength. Our vitamin K2 and vitamin K pages catalog the forms and the food sources; this guide prices the counted bottles. The same per-unit method priced magnesium, calcium, and omega-3 fish oil in earlier guides.

The verified MK-7 shelf, cheapest first

Seventeen verified menaquinone-7 bottles made the table. The floor is a 300-softgel bottle of 200 mcg softgels at 4.1 cents per 100 mcg; the ceiling is a 30-softgel bottle of 50 mcg softgels at 80.6 cents — a 19.6-times spread on words that all say vitamin K2. Between them sit a 365-tablet year bottle, four branded-raw-material bottles, and a trap row whose honest rate is double its name math, priced in place below.

The two-capsule serving line

One bottle in the table hides a second number behind the word serving. The Piping Rock listing is named 100 mcg, and 100 mcg is exactly what the panel prints — but the panel prints it against a serving of two capsules, ninety servings in a 180-capsule bottle. Each capsule carries 50 mcg. Priced by the name figure, the bottle looks like $0.1111 per 100 mcg, second-cheapest rate on the shelf; priced by the panel, it is $0.2221, double the name math, with nine of the seventeen verified bottles priced below it. The error compounds in time: read honestly, a year at the labeled serving costs $81.07, not the $40.53 that a one-capsule reading of the name implies. This is the same trap the melatonin and probiotic guides caught on their aisles, and the defense is the same one: the phrase per serving on a front label is a reason to open the panel, not a reason to trust the arithmetic. Nothing here says the bottle is mislabeled — the panel is printed plainly — but the name alone prices the bottle at half its real rate.

When the form word is missing

Two verified bottles print a form of vitamin K2 that is not menaquinone-7, and one of them wears a name that does not say so. The Carlyle bottle is named plainly — vitamin K2, 100 mcg, 240 capsules — and at $11.99 it is the cheapest bottle on the verified shelf by price, at $0.0500 per 100 mcg. Its panel prints menaquinone-4, the MK-4 form, at 100 mcg a capsule. The other MK-4 bottle announces itself: SFI Health Ultra K2 packs 15,000 mcg of menaquinone-4 into each of 90 capsules, a strength pattern about three orders of magnitude past the MK-7 shelf. We price both below, in their own table, under their own form word — per-100-mcg rates across different forms of K2 are printed for transparency, not ranked as if the bottles were interchangeable, because the forms differ in typical serving size and in how the label mathematics behave at these strengths.

The lesson costs nothing to learn: if a name says vitamin K2 and stops there, the form lives on the panel, and on this shelf the unnamed form was the cheapest bottle of the nineteen by price. A third bottle teaches the composite version of the same lesson — Source Naturals K2 Advantage names 2,200 mcg, and its panel divides that figure across three lines: 1,820 mcg of vitamin K1, 200 mcg of MK-4, and 180 mcg of MK-7. The name number is mostly K1. We kept it out of the MK-7 table because no single line carries the name figure.

Brands, natto words, and bottle size

Four verified bottles name the same branded raw material family, and the spread inside it is steep. Now Foods extra strength, made with menaquinone-7 from chickpea, prices at $0.0930 per 100 mcg; the three bottles naming a MenaQ7 raw material — Utzy at $0.3703, Ortho Molecular at $0.3981, Protocol For Life Balance at $0.4061 — run roughly four to four and a half times that rate for 160-to-180-mcg capsules. Swanson approaches the shelf from the opposite direction with three bottles whose panels print menaquinone-7 from natto: 200 mcg at $0.6332, 100 mcg at $0.6497, and 50 mcg at $0.8060 per 100 mcg, the dearest verified rate on the shelf. Whatever a fermented-food origin adds to a label, it adds to the price as well, and the 50-microgram thirty-count pays the most for it.

Bottle size prices as loudly as provenance. Nutricost sells the same 100 mcg softgel in a 120-count at $0.1163 per 100 mcg and a 30-count at $0.5000 — a 4.3-times premium for buying a quarter of the bottle. The Swanson trio repeats the pattern inside one product line, and the shelf-wide year math shows what the premiums cost over time: at one serving a day, a year of the NutraLife year bottle runs $20.99, a year of the floor bottle runs $30.02, and a year of the Swanson Real Food thirty-count runs $462.21. Dose-matched to 100 mcg a day, the floor bottle prices a year at $15.01 while the 45-mcg Life Extension bottle — two to three softgels a day to reach the same figure — prices the same year at $126.07, an 8.4-times gap that is entirely about serving size arithmetic.

The D3 pairing premium

Most K2 on this site is not sold alone. Eleven counted, priced listings pair K2 with other actives — a D3 capsule beside it most often, sometimes calcium, sometimes a blend — and every one of them sits out of the math, because a shared price cannot be divided into a per-microgram rate for one ingredient. The panels we read show how far the pairing goes: a Source Naturals tablet lists vitamin D3, vitamin K2 as menaquinone-7, 200 mg of calcium, and a Bacillus subtilis extract on one panel; a Now Foods capsule pairs 5,000 IU of D3 with MK-7; store brands sell the pair as a single SKU at both the 100-mcg and 125-mcg strengths. Pairing is a legitimate way to buy two labels at once, and readers comparing those bottles can price the D3 side with our earlier vitamin D3 guide and our vitamin D page. What the pair cannot do is tell you what either half costs — which is why the single-ingredient shelf above is the only place the per-mcg number exists at all.

What we left out, and how to read a K2 label

Four exclusions carry this guide. A Foster And Thrive 100 mcg hundred-count was out of stock at its retailer with its facts printed only on product images, so no panel could be read — an unverifiable price is not a price. A Piping Rock two-bottle pack repeated a single listing at multipack wording and stayed out for the same perishability reason that removed case packs in earlier guides. A VitaBright listing from a United Kingdom retailer carried count wording that did not parse into a container figure. And eleven D3-paired and blended listings sat out on the shared-price rule above. Every exclusion is a finding: on this aisle the honest per-mcg number exists only where a single-ingredient panel meets a single live price.

That leaves a reading order for any K2 bottle, which is what this guide is for. Read the form word first — menaquinone-7 or menaquinone-4 — because plain K2 names on this shelf have meant both. Read the serving line second, because 100 mcg can describe one capsule or two. Read the count third, because the same softgel prices 4.3 times higher in a thirty-count than a hundred-twenty. Then price it against the ruler: 4 cents per 100 mcg is the floor of a nineteen-bottle verified shelf, 8 cents buys the cheap half of it, and anything north of 40 cents is paying for a brand word, a fermented-food word, or a thirty-count bottle — every one of which is printed where you can see it.

*Prices in this guide were verified against live retailer listings on October 31, 2026, and change frequently. This article describes products, prices, and label content only; it is not medical advice, and you should consult a qualified professional with any health questions before starting any supplement.*