Ultra K2 Menaquinone offers a clear calcium management approach, and MK-4 helps support bone density and keep arteries healthy, while Klaire Labs' trusted heritage backs quality and safety. This vegan K2 formula has few inactive ingredients and is hypoallergenic, making it gentler on sensitive stomachs. Klaire Labs has been a trusted name in supplements since 1969, and GMP quality assurance means you’re getting purity and potency you can rely on.

Available Sizes & Variants:

90 capsules - convenient daily supply for ongoing bone, joint and heart health support.

Benefits & Features:

• Supports bone density with the MK-4 form, helping bones stay strong.
• Directs calcium to bones for healthier arteries.
• MK-4 crosses barriers to support cartilage and connective tissue while aiding bone health.
• Manufactured under GMP quality standards with allergen free and non GMO assurances.
• Designed for daily use as a vitamin k2 supplement, it also complements vitamin d3 k2 supplement strategies for supporting bone health and calcium balance overall.

Ultra K2 Menaquinone by Klaire Labs (now SFI Health) draws on decades of allergen free, high purity practice. The MK-4 form is vegan and synthetic yet identical to the natural version, offering a vegan, non GMO option with no major allergens. Manufactured under GMP quality assurance, it supports bone density, cardiovascular health and connective tissue integrity. Japanese clinical work has long studied MK-4's effects, including its ability to cross the blood brain barrier, expanding its potential reach.

(other) Microcrystalline cellulose, vegetarian capsule (hydroxypropyl methylcellulose, water), and silicon dioxide.

• GTIN: 817234010831
• Manufacturer: Klaire Labs
• Categories: Klaire LabsNew ArrivalsPopular Supplement Brands
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take one capsule daily with food, or follow your healthcare professional's instructions. As a dietary supplement\, take one softgel per day with a meal\, or as directed by your health care practitioner.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Vitamin K2 MK-4 (Menaquinone-4)

Vitamin K2 MK-4 is a fat-soluble vitamin essential for calcium utilisation in the body. This synthetic vegetarian form is chemically identical to naturally occurring menaquinone-4 and is designed to support bone and connective tissue function.

This form is vegetarian and synthetic, with minimal inactive ingredients, formulated to be hypoallergenic and suitable for vegan diets.

What Does Vitamin K2 MK-4 Do?

Vitamin K2 MK-4 activates matrix Gla-proteins and osteocalcin, which direct calcium away from soft tissues and into the bone matrix to support skeletal structure. The MK-4 form also has potential effects on cartilage health and joint flexibility through connective tissue maintenance.

In addition, this MK-4 form is capable of crossing the blood-brain barrier, suggesting broader biological reach in supporting normal physiological processes.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Why Klaire Labs Ultra K2 Menaquinone is Welzo Chosen

This brand's reputation for quality and dependability began long before today, with Klaire Labs (now SFI Health) recognised as a trusted name in the supplement industry since 1969. This longevity, paired with a commitment to purity and potency, places Klaire Labs among the most credible manufacturers in the market. Our medical team our medical team evaluated Klaire Labs against peers for consistency in formulation and manufacturing standards, emphasising rigorous quality control and transparent practices, including GMP Quality Assured production and allergen-free, Non-GMO formulations how we verify ingredient quality.

The brand really shines for product-specific quality, offering hypoallergenic, minimal inactive ingredients and a synthetic yet biologically identical MK-4 vitamin K2, manufactured under professional-grade standards. This aligns with Welzo’s criteria for reliability and safety when selecting a supplier. The result is a strong, trust-led partnership that prioritises consistent quality for customers. This is why Klaire Labs Ultra K2 Menaquinone fits nicely into our product portfolio and meets our rigorous vetting process.