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Head-to-head evidence comparison — which supplement is right for you?
Vitamin E vs Vitamin K2: they're closely matched on evidence (5 vs 6/10); they're alternatives for menopause support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Vitamin E and Vitamin K2 are closely matched across evidence, studies, and safety.
Verdict
Likely helps
19 of 21 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
12 of 14 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Vitamin E and Vitamin K2 have evidence — compare verdict strength side-by-side.
100-400 IU daily (natural d-alpha-tocopherol)
With fat-containing meal, Any time of day
Natural mixed tocopherols (d-alpha, beta, gamma, delta)
100-200mcg (MK-7)
With a meal containing fat
MK-7 (menaquinone-7)
Vitamin E at supplement doses measurably lowered vitamin K status in adults with normal clotting. Menaquinone is taken to carboxylate osteocalcin and matrix Gla protein — the very reaction high-dose vitamin E impairs — so the two work against each other.
Keep vitamin E at or below 400 IU/day if you are also taking K2, and separate them by a few hours to reduce absorption competition. Do not use this pairing to self-manage clotting: if you are on an anticoagulant, both belong in a conversation with the prescriber.
4-8 weeks
4-8 weeks
8-12 weeks
With high doses
6-12 months
1-3 years
Effect of vitamin B(2), vitamin C, vitamin D, vitamin E and folic acid in adults with essential hypertension: a systematic review and network meta-analysis
BMJ open (2024) · Meta analysis · n=2218
Among the five vitamins, only vitamin E was significantly more effective at reducing SBP (mean difference: -14.14 mm Hg, 95% credible intervals: -27.62 to -0.88) than placebo.
The Effect of Vitamin E Supplementation on Serum Aminotransferases in Non-Alcoholic Fatty Liver Disease (NAFLD): A Systematic Review and Meta-Analysis
Nutrients (2023) · Meta analysis · n=794
Three electronic databases (MEDLINE, CENTRAL, and Embase) were reviewed for randomized trials that tested vitamin E supplementation versus placebo or no intervention in patients with NAFLD, published until April 2023.
Vitamin E supplementation in pregnancy
The Cochrane database of systematic reviews (2015) · Meta analysis · n=19023
Women supplemented with vitamin E in combination with other supplements compared with placebo were at decreased risk of having a placental abruption (RR 0.64, 95% CI 0.44 to 0.93, seven trials, 14,922 participants, I² = 0%; high quality evidence).
Vitamins K2 and D3 Improve Long COVID, Fungal Translocation, and Inflammation: Randomized Controlled Trial
Nutrients (2025) · Rct · n=151
The median age was 46 years; 71% were female and 29% were non-white.
The effect of vitamin K2 supplementation on bone turnover biochemical markers in postmenopausal osteoporosis patients: a systematic review and meta-analysis
Frontiers in endocrinology (2025) · Meta analysis · n=2570
Vitamin K2 (VK2) increased osteocalcin (OC; MD 1.86, 95% CI 1.17-2.56) and bone-specific alkaline phosphatase (BAP; MD 1.49, 95% CI 0.98-2.00).
Vitamin K2 in Managing Nocturnal Leg Cramps: A Randomized Clinical Trial
JAMA internal medicine (2024) · Rct · n=310
Of the 199 enrolled individuals, 108 (54.3%) were female, and the mean (SD) age was 72.3 (5.5) years.
Based on meta-analysis showing 14.14 mmHg reduction in SBP. Effect size is modest and bleeding risk increases above 400 IU daily. Natural d-alpha-tocopherol preferred over synthetic forms.
Based on meta-analyses showing 2.17% WMD improvement in lumbar BMD. Effects primarily demonstrated with MK-7 form in postmenopausal women. Combination with vitamin D3 may enhance effects.
AI-estimated from published studies. Interpret as directional guidance.
Both Vitamin E and Vitamin K2 are closely matched — the best choice depends on your specific health goals.
For menopause support, Vitamin K2 has a higher relevance score (80 vs 38).
Vitamin E at supplement doses measurably lowered vitamin K status in adults with normal clotting. Menaquinone is taken to carboxylate osteocalcin and matrix Gla protein — the very reaction high-dose vitamin E impairs — so the two work against each other. Keep vitamin E at or below 400 IU/day if you are also taking K2, and separate them by a few hours to reduce absorption competition. Do not use this pairing to self-manage clotting: if you are on an anticoagulant, both belong in a conversation with the prescriber. Consult a healthcare provider for personalized advice.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.