Life Extension Super K Complex
by Life Extension
"Comprehensive vitamin K with K1, MK-4, and MK-7 — all three forms of vitamin K for bone and cardiovascular health"
Overview
Life Extension Super K Complex provides all three bioactive forms of vitamin K in one softgel: vitamin K1 (phytonadione, 1500mcg), vitamin K2 as MK-4 (1000mcg), and vitamin K2 as MK-7 (100mcg). K1 supports blood clotting, MK-4 supports bone metabolism, and MK-7 has the longest half-life for sustained cardiovascular protection. Most vitamin K supplements only include one form, making this comprehensive approach unique. Life Extension's science-first formulation ensures clinically meaningful doses of each form.
Key Ingredients
| Ingredient | Amount |
|---|---|
| Vitamin K1 (Phytonadione) | 1500 mcg |
| Vitamin K2 (MK-4) | 1000 mcg |
| Vitamin K2 (MK-7) | 100 mcg |
Pros & Cons
What We Like
- All three vitamin K forms
- Clinically meaningful doses
- 90 softgels (3-month supply)
- Life Extension quality
- 8,500+ reviews
What Could Be Better
- Contraindicated with blood thinners
- Premium price for vitamin K
- Must consult doctor if on warfarin
- Not combined with D3
Who Is This For?
Best For
- Bone health optimization
- Cardiovascular calcium management
- Those taking vitamin D3
- Those wanting comprehensive K
Not Ideal For
- Those on warfarin/blood thinners
- Budget seekers
- Those wanting K2 only
- Those wanting D3+K2 combo
Our Verdict
Life Extension Super K is the most comprehensive vitamin K supplement — all three forms at meaningful doses. Essential companion to vitamin D3 supplementation for directing calcium to bones rather than arteries.