Source Naturals Vitamin K2 + D3 Bone & Heart Health Complex - 400 IU Vitamin D3 & 100 mcg Vitamin K2 (MK-7) with Calcium - 60 Tablets

Understanding the Synergy: How D3 and K2 Work Together

Vitamin D3 and K2 play complementary roles in calcium metabolism. D3 (cholecalciferol) enhances calcium absorption from the gut, while K2 (menaquinone-7) activates proteins that help direct calcium to bones and away from arteries. The MK-7 form of K2 lasts up to 12 times longer in the body than other forms, providing sustained support. Each tablet offers 400 IU of D3 and 100 mcg of K2.

Key Health Benefits

Bone Health Support: Vitamin D3 aids calcium absorption, and Vitamin K2 helps incorporate calcium into the bone matrix, contributing to normal bone mineral density. This combination is particularly beneficial for maintaining skeletal strength as we age.

Cardiovascular Health: By activating matrix GLA protein (MGP), Vitamin K2 may help maintain arterial elasticity and support normal calcium distribution away from vascular tissues, helping preserve healthy blood flow.

Why Take Vitamin D3 and K2 Together?

Taking D3 and K2 together optimises their synergistic effect. While D3 increases calcium uptake, K2 ensures that calcium is used where it is needed—bones and teeth—rather than accumulating in soft tissues. This partnership supports both bone density and arterial flexibility, offering a comprehensive approach to skeletal and heart health.

What to Look For in a D3 + K2 Supplement

Choose a supplement with a balanced dosage, high-quality K2 (MK-7), and strict manufacturing standards. Source Naturals delivers 400 IU D3 and 100 mcg K2 (MK-7) per tablet, a ratio aligned with current research for daily maintenance. The tablets are manufactured in the USA under Good Manufacturing Practices (cGMPs). They contain no yeast, dairy, egg, gluten, or wheat, and no preservatives or artificial colours, flavours, or fragrances. The brand has over 40 years of trust in the supplement industry, founded in 1982.

Frequently Asked Questions

When is the best time to take Vitamin D3 and K2? Take with a meal containing fat for optimal absorption, as both are fat-soluble. Many people take them with breakfast or lunch.

Can I take Vitamin D3 and K2 with other supplements? Yes, they pair well with calcium, magnesium, and other bone-support nutrients. However, if you take blood thinners (e.g., warfarin), consult your health care provider before taking Vitamin K2, as it may interfere with medication.

Are there any side effects? Generally well tolerated. High doses of D3 may cause calcium imbalance; stick to recommended dosages. K2 (MK-7) is safe for most people.

How long does it take to see results? Benefits are cumulative. Consistent daily uses supports long-term bone and heart health.

Recommended Dosage

For adults, take one tablet daily with a meal, unless otherwise directed by a health care professional. This provides 400 IU of Vitamin D3 and 100 mcg of Vitamin K2 (as MK-7). These levels are appropriate for general maintenance. If you have specific health concerns, consult your practitioner to determine the right dosage for you.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. Keep out of reach of young children. Do not exceed the stated recommended daily dose.