Vitamin K2 Cream: What the Eight-Week Study Measured

Before choosing a cream, write down the change you want and the evidence you want explained. Keep the seller’s wording beside the answer so you can compare the promise with its support.

What was tested in people?

The 2026 study tested a 0.05% menaquinone-7 (MK-7) cream against the same base without MK-7, on opposite facial and neck sides, twice daily for eight weeks. Thirty of 36 recruited women, aged 35–60, completed it. [1]

At week eight, facial maximum wrinkle roughness favored MK-7 by 4.95% versus placebo (P<.05). Average facial roughness and both neck wrinkle measures did not retain significance after adjustment. Elasticity and a photographic jawline-angle measure favored MK-7. [1]

Cell experiments assessed mitochondrial energy measures; molecular biomarkers were not measured directly in participants. The human analysis excluded noncompleters. Nanjing Ascend Biotech funded testing and supplied MK-7; disclosures included company affiliations and a related patent application. [1]

This was not a study of GLP-1-associated facial changes or restored facial volume. It does not establish an oral supplement's effects. [1]

What does a product's wording promise?

FDA distinguishes U.S. cosmetic claims, such as making lines less noticeable through moisturizing, from claims to affect the body's structure or function. It gives increasing skin collagen production as an example of a drug claim. Cosmetics generally do not require FDA approval before marketing; a published paper is not FDA approval of a cosmetic's effectiveness. [2]

Save the exact wording that interests you. Is the seller promising a change in the appearance of lines, a measured skin property or a biological mechanism? Ask which human result supports that particular promise and whether it concerns the product being sold.

If your concern began during GLP-1 treatment or weight loss, describe the timing and the area to your dermatologist. Ask what assessment would distinguish a skin-surface concern from a change in facial contour. Keep that discussion separate from decisions about your prescription.

Ask about the finished cream

Write down the full product name, ingredient list, amount in the container and directions. If a sales page cites an ingredient study, ask whether the finished product was tested and how its formulation compares with the one in the paper.

Use a specific request: “Please identify the human study for this cream, the comparison product, the number of people analyzed and the result at the final visit. Does your percentage describe an instrument reading or a visible change assessed by people?”

Keep the answer with the claim. Do not treat a percentage from a cell experiment as a percentage reduction in your wrinkles. Ask the seller to explain the measurement rather than converting it into a promise about appearance yourself.

Check tolerance before broad use

AAD recommends trying a new skincare product on a quarter-sized area, such as the underside of the arm or elbow bend, twice daily for seven to ten days, using the normal amount and leaving it on for the intended time. If redness, itching or swelling develops, gently wash it off and stop using it. A severe reaction that does not settle needs dermatology assessment. [3]

This home check differs from medical patch testing used to investigate an allergy. AAD advises speaking with a dermatologist when the cause of irritation is unclear. [3]

If you have a known ingredient allergy or a current skin-treatment plan, discuss the proposed cream before trying it. Bring its label and your existing routine to the appointment. Ask how to introduce it, what to stop if irritation occurs and when to review whether it is helping.

For related evidence, see retinol and tretinoin and a skincare bundle used with picosecond laser.

Printed book

How to Keep Your Face on GLP-1

$12.95 + free shipping

Order Now

✓ 30 day money back guarantee

This article provides general education, not a diagnosis or an individual treatment plan. Medication information refers to US sources. Discuss medication, nutrition and cosmetic treatment decisions with qualified clinicians.