Vitamin D3 4000 IU + K2 mcg
XtendLife
Overview
This product delivers a potent and synergistic combination of Vitamin D3 and K2 in well-researched forms and dosages. The inclusion of both MK-4 and MK-7 forms of K2 ensures comprehensive bioavailability and action in the body. While the marine calcium content is minimal, the primary benefit comes from the vitamins' roles in calcium regulation.
The Good
Optimal D3 Dose: Provides 4000 IU (100 mcg) of Vitamin D3, a clinically effective dose for many individuals to maintain healthy levels.
Dual K2 Forms: Contains both MK-4 (90 mcg) and MenaQ7 (MK-7, 90 mcg) of Vitamin K2, offering broad-spectrum benefits for bone and cardiovascular health due to their distinct actions and half-lives.
Synergistic Formula: D3 and K2 work together to ensure proper calcium absorption and utilization, directing calcium to bones and away from arteries.
The Bad
Potential Drug Interactions: Vitamin K2 can interfere with blood-thinning medications (anticoagulants) like Warfarin, requiring medical consultation.
Calcium Dose is Minimal: While present, the 30 mg of marine calcium is a very small contribution to daily calcium needs and primarily acts as a minor co-factor rather than a primary source.
Individual Needs Vary: 4000 IU of Vitamin D3 may be too high for individuals with already sufficient D levels or certain medical conditions, necessitating blood test-guided supplementation.
Is it for you?
Best For: Individuals with Vitamin D deficiency, those seeking bone health support, immune system enhancement
Skip If: You are on blood-thinning medication (e.g., Warfarin) without consulting a doctor, or have hypercalcemia.
Ingredients Analysis
Vitamin D
100 mcgVitamin K2 Blend
180 mcgMenaquinone-4
90 mcgMena Q7
90 mcgCalcium
30 mgBlack Currant; Powder
300 mgHow to Use
Take one capsule daily with a meal, preferably one containing dietary fat for optimal absorption.
Daily
Anytime
With a meal containing fat
Who Should Use This
Best For:
Similar Products
Recommended Articles
Herbal Boosters & COVID-19 Antivirals: Safe Mix?
Herbal supplements may interact with COVID-19 antivirals, requiring careful consideration and further research.
2025's Top Vegan Protein Powders: A Buyer's Guide
In 2025, the best vegan protein powders are third-party tested, ensuring purity, safety, and high nutritional content.
Immune Supplements & Pregnancy Safety 2025
The safety of immune-boosting supplements during pregnancy in 2025 hinges on supplement type, dosage, and health conditions.
Top Immune Support Ingredients: What Works?
Vitamin D, zinc, and echinacea are key ingredients in immune support supplements, backed by scientific evidence.