How to Choose a Vitamin K1 Supplement

When selecting a vitamin K1 supplement, consider both the form and the dosage. Tablets are a convenient option, typically containing phylloquinone from natural or synthetic sources. Source Naturals offers a high-quality form of vitamin K suitable for vegetarians. Look for products free from unnecessary additives like yeast, dairy, egg, soy, starch, and artificial colours. Third-party testing and cGMP manufacturing guarantee purity and potency. With over 40 years of experience, Source Naturals produces its supplements in Scotts Valley, CA under strict quality controls, ensuring you receive a reliable product.

Health Benefits of Vitamin K1

Vitamin K1 is best known for activating clotting factors, which are essential for normal blood coagulation. Without adequate vitamin K, the body cannot produce prothrombin, a protein critical for blood clotting. Additionally, vitamin K1 contributes to bone health by modifying osteocalcin, a protein that binds calcium to the bone matrix. Research suggests that adequate intake may help maintain bone density as we age. Emerging studies also indicate a potential role in supporting cardiovascular health by preventing arterial calcification, although more research is needed. A daily supplement like Source Naturals Vitamin K provides a reliable source of phylloquinone to fill dietary gaps, especially for those with limited intake of leafy greens.

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 hemostasis and skeletal health.

Vitamin K1 vs K2: Key Differences

While both vitamin K1 and vitamin K2 (menaquinone) are important, they serve distinct roles. Vitamin K1 is primarily involved in blood clotting and 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. Both forms are complementary and often combined in comprehensive wellness regimens.

Recommended Dosage

The adequate intake for vitamin K in adults is 90 mcg per day for women and 120 mcg per day for men. Many supplements offer higher doses to support specific health goals. Source Naturals Vitamin K provides 500 mcg per tablet, a dose well above the baseline but 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 healthcare 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, follow the recommended dosage and seek medical advice if you have underlying health conditions. Consult a healthcare practitioner prior to use if you are taking blood thinners.

This product is not intended to diagnose, treat, , or prevent any disease. Always read the label and follow directions for use.

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.