Klaire Labs SFI Health Ultra K2 Menaquinone-4 - 15mg Vitamin K2 MK-4 per Capsule - Hypoallergenic & Vegan Bone Support (90 Capsules)

Why Choose Vitamin K2 MK-4?

Vitamin K2 as menaquinone-4 (MK-4) is one of the most researched forms of vitamin K, renowned for its rapid utilisation by the body. This fat-soluble nutrient is essential for calcium metabolism, helping to direct calcium to the bones and teeth where it is needed, while preventing its build-up in soft tissues. Our Ultra K2 supplement provides a potent 15mg dose per capsule in a hypoallergenic, vegan-friendly formula, free from common allergens and genetically modified ingredients.

Health Benefits of Vitamin K2 MK-4

• Bone Health: Vitamin K2 contributes to the maintenance of normal bones by activating osteocalcin, a protein that binds calcium to the bone matrix.*
• Blood Coagulation: Vitamin K2 supports normal blood clotting through the activation of clotting factors.*
• Calcium Utilisation: By activating matrix Gla protein (MGP), K2 helps ensure calcium is used where it is needed most—in bones and teeth—rather than depositing in arteries and other soft tissues.

These benefits are well-documented in clinical research, particularly for the MK-4 form.

What Is Vitamin K2 (MK-4)?

Vitamin K2, specifically the menaquinone-4 (MK-4) variant, is a fat-soluble vitamin vital for calcium regulation and overall health. Unlike vitamin K1, which is primarily involved in blood clotting, K2 assists in directing calcium to the bones and teeth while discouraging its deposition in soft tissues like arteries. This makes it crucial for maintaining strong bones and a healthy cardiovascular system. MK-4 is the most studied form of vitamin K2 and is naturally found in animal products such as egg yolks, butter, and liver. However, dietary intake alone may not be sufficient, making supplementation a practicable choice.

Vitamin K1 vs K2: Key Differences

Although both are forms of vitamin K, K1 (phylloquinone) is mainly obtained from leafy green vegetables and is used primarily for blood clotting. K2, on the other hand, is more effective at activating vitamin K-dependent proteins that regulate calcium distribution. The MK-4 form has a shorter half-life but is rapidly utilised by tissues, offering targeted support. K2 can be further divided into MK-4 and longer-chain menaquinones (e.g., MK-7), each with unique absorption and activity profiles. Understanding these differences helps consumers select the right supplement for their health goals.

Recommended Dosage

Each capsule of Ultra K2 provides 15 mg (15,000 mcg) of vitamin K2 as MK-4. Typical dosages range from 15–45 mg daily, depending on individual needs and health objectives. For best absorption, take with a meal containing fat. As with any supplement, consult your health care professional to determine the appropriate dosage for your situation.

Potential Side Effects & Interactions

Vitamin K2 is generally well tolerated, with few reported side effects. High doses may occasionally cause mild gastrointestinal discomfort. Vitamin K can interfere with anticoagulant medications such as warfarin (Coumadin). If you are taking blood thinners, consult your GP before using any vitamin K supplement. Always inform your health care provider about all supplements you are taking.

How to Choose a Vitamin K2 Supplement

When selecting a K2 supplement, consider the form (MK-4 vs. MK-7), potency, and purity. MK-4 is ideal for short-term, targeted support, whereas MK-7 provides longer-lasting effects. Look for products that are third-party tested for quality and free from unnecessary additives. This supplement is hypoallergenic, vegan, and non-GM, making it suitable for a wide range of dietary needs.

Frequently Asked Questions

What is the difference between MK-4 and MK-7?

MK-4 has a shorter half-life but is rapidly utilised by tissues, making it ideal for immediate support. MK-7 remains in the bloodstream longer, offering sustained activity. Both are effective and often chosen based on personal preference or health goals.

Can I take this with vitamin D or calcium?

Yes, vitamin K2 works synergistically with vitamin D and calcium. Vitamin D enhances calcium absorption, while K2 directs it to bones and away from arteries—a combination often recommended for bone and heart health.

*These statements have not been evaluated by the Medicines and Health care products Regulatory Agency (MHRA). This product is not intended to diagnose, treat, , or prevent any disease.