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Head-to-head evidence comparison — which supplement is right for you?
Marine Collagen vs Vitamin K2: they're closely matched on evidence (6 vs 6/10); they're alternatives for bone health — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Marine Collagen and Vitamin K2 are closely matched across evidence, studies, and safety.
Verdict
Likely helps
4 of 4 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
10 of 13 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Marine Collagen and Vitamin K2 have evidence — compare verdict strength side-by-side.
5-10g daily
Morning or evening, Can add to beverages or food
Hydrolyzed marine collagen powder
100-200mcg (MK-7)
With a meal containing fat
MK-7 (menaquinone-7)
8-12 weeks
8-12 weeks
4-8 weeks
12-16 weeks
6-12 months
1-3 years
Marine collagen and its derivatives: Versatile and sustainable bio-resources for healthcare
Materials science & engineering. C, Materials for biological applications (2020) · Review
Particular attention is given to the bioactive properties of marine collagen that are being explored in preclinical and clinical studies, and pave the way to an increased demand for this biomaterial in the next future.
Collagen and gelatin
Annual review of food science and technology (2015) · Review
Numerous studies have investigated the bioactivities and biological effects of collagen, gelatin, and their hydrolysis peptides, using both in vitro and in vivo assay models.
Recent Advancements in Marine Collagen: Exploring New Sources, Processing Approaches, and Nutritional Applications
Marine drugs (2025) · Review
Hence, recent interest has propelled research in identifying novel collagen sources and advancing technologies to produce marine collagen-based products.
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 systematic reviews of marine collagen for skin applications. Studies show variable results with 8-12 week protocols. Fish source and peptide size affect bioavailability. Most studies used 5-10g daily doses.
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 Marine Collagen and Vitamin K2 are closely matched — the best choice depends on your specific health goals.
For bone health, Vitamin K2 has a higher relevance score (88 vs 65).
No known interactions between Marine Collagen and Vitamin K2 have been documented in our database. However, always consult a healthcare provider before combining supplements.
Modest-but-real for skin, growing for joints, weak for hair/nails — plus which type to buy.
Which supplements clash with blood thinners, thyroid meds, antibiotics & more — and what to do.
Hot flashes, bone, sleep, muscle — the basics that hold up vs the phytoestrogen hype.
Worth it if you’re deficient (and many are) — dosing, testing, D3 vs D2, and the K2 question.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.