Source Naturals Vitamin K - 500 mcg - 100 Tablets

Health Benefits of Vitamin K1

Vitamin K1 is best known for its role in activating clotting factors, which are essential for normal blood coagulation. According to the European Food Safety Authority (EFSA), vitamin K contributes to normal blood clotting and the maintenance of normal bones. By modifying osteocalcin, a protein that binds calcium to the bone matrix, vitamin K1 helps support bone density as you age. Emerging research also suggests a potential role in cardiovascular health by preventing arterial calcification, whilst more studies are needed. A daily supplement like Source Naturals Vitamin K provides a reliable source of phylloquinone to help fill dietary gaps, especially for those with limited intake of green leafy vegetables.

What is Vitamin K1?

Vitamin K1, also known as phylloquinone, is a fat-soluble vitamin naturally found in green leafy vegetables. It plays a crucial role in the body's blood clotting mechanisms and supports bone metabolism. Unlike some other forms of vitamin K, K1 is derived primarily from plant sources and is quickly utilised by the liver for coagulation factor synthesis. This makes it an essential nutrient for maintaining normal haemostasis and skeletal health.

How to Choose a Vitamin K1 Supplement

When selecting a vitamin K1 supplement, consider the form and dosage. Tablets are convenient and typically contain phylloquinone derived from natural or synthetic sources. Source Naturals use a high-quality form of vitamin K that is suitable for vegetarians and vegans. Look for supplements that are free from unnecessary additives, such as yeast, dairy, egg, soya, starch, and artificial colours. Third-party testing and cGMP manufacturing ensure purity and potency. Source Naturals has been trusted for over 40 years, with products made in Scotts Valley, CA under strict quality controls.

Recommended Dosage

The adequate intake for vitamin K in adults is 90 mcg per day for women and 120 mcg per day for men. However, many supplements offer higher doses to support specific health goals. Source Naturals Vitamin K provides 500 mcg per tablet, a dose that is well above the baseline but still within safe limits. For most adults, taking one tablet daily with a meal is recommended, as fat-soluble vitamins are better absorbed when consumed with dietary fat. Always consult a health care professional before starting any new supplement, especially if you are on blood-thinning medications like warfarin.

Potential Side Effects & Interactions

Vitamin K1 is generally safe and well-tolerated when taken as directed. Side effects are rare but may include mild gastrointestinal discomfort. The primary concern with vitamin K supplements is their interaction with anticoagulant medications, such as warfarin (Coumadin). Because vitamin K promotes blood clotting, it can reduce the effectiveness of these drugs. Individuals on anticoagulants should maintain consistent vitamin K intake and consult their doctor before supplementing. Additionally, high doses of vitamin K are not recommended for those with certain liver conditions or those undergoing dialysis. As with any supplement, it is important to follow the recommended dosage and seek medical advice if you have underlying health conditions.

Vitamin K1 vs K2: Key Differences

While both vitamin K1 and vitamin K2 (menaquinone) are important, they serve distinct roles in the body. Vitamin K1 is primarily involved in blood clotting and is stored in the liver. In contrast, vitamin K2 is more widely distributed and supports bone and cardiovascular health by activating proteins that regulate calcium deposition. Supplementing with K1 is particularly beneficial for individuals focussed on coagulation support, whereas K2 may be preferred for bone and arterial health. However, both forms are complementary and often combined in comprehensive wellness regimens.

Frequently Asked Questions

Can I take vitamin K1 with other supplements?

Yes, vitamin K1 pairs well with other fat-soluble vitamins like vitamin D and calcium for bone support. However, avoid taking high doses without professional guidance if you are on medication.

Is this supplement vegan?

Yes, Source Naturals Vitamin K tablets are suitable for vegetarians and vegans, containing no animal-derived ingredients.

How should I store the tablets?

Store in a cool, dry place away from direct sunlight. Keep the bottle tightly closed when not in use.

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. Food supplements should not be used as a substitute for a varied diet and healthy lifestyle.