Loading…
We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Head-to-head evidence comparison — which supplement is right for you?
Hydroxyapatite (MCHC) vs Zinc: Zinc has the stronger overall evidence (8.5 vs 4.5/10); 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.
Zinc wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Likely helps
13 of 15 studies with measurable effects showed benefit.
Top outcomes
3,320 mg of the compound daily, as two 830 mg tablets twice a day (about 712 mg elemental calcium), the regimen of the 3-year osteoporosis trial and the 851-woman cohort. A 6-month pain trial used 1,660 mg a day.
Split doses with meals, Morning and evening
Ossein-hydroxyapatite compound tablets
15-25mg daily (a typical label dose, not the dose used in the cited trials, which used about 30 mg a day)
With meals
Zinc picolinate or zinc citrate
and 7 more not shown
and 4 more not shown
In postmenopausal women an extra 468 mg calcium a day as calcium phosphate cut net zinc absorption by about 2 mg/day, and 600 mg calcium carbonate taken with a meal halved zinc absorption from it.
Take zinc between meals and hydroxyapatite with meals, at least 2 hours apart.
12-36 months
N/A
Hours to 3 months
5-6 months
2-4 weeks
2-4 weeks
4-8 weeks
Immediate
Efficacy of ossein-hydroxyapatite complex compared with calcium carbonate to prevent bone loss: a meta-analysis.
Menopause (2009) · Meta analysis
Meta-analysis of randomised controlled trials comparing ossein-hydroxyapatite complex (OHC) with calcium carbonate, not with placebo. Of 18 controlled trials identified, 6 were pooled in a random-effects model, and the abstract does not give the total number of participants.
Comparison of the treatment effects of ossein-hydroxyapatite compound and calcium carbonate in osteoporotic females.
Osteoporos Int (1995) · Rct · n=40
Randomised, double-masked trial in 40 women with postmenopausal osteoporosis, each given 1,400 mg calcium a day as either OHC or calcium carbonate for 20 months.
Comparison of the effects of ossein-hydroxyapatite complex and calcium carbonate on bone metabolism in women with senile osteoporosis: a randomized, open-label, parallel-group, controlled, prospective study.
Clin Drug Investig (2011) · Rct · n=120
Randomised, open-label trial in 120 women over 65 with osteoporosis (55 OHC, 65 calcium carbonate), of whom 54 completed 3 years. OHC gave 712 mg elemental calcium a day and calcium carbonate 1,000 mg, and both groups also took calcifediol.
Efficacy of Zinc Supplementation in the Management of Primary Dysmenorrhea: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis · n=739
Zinc supplementation significantly reduced pain severity compared to placebo (Hedges's g = -1.541; 95% CI: -2.268 to -0.814; p < 0.001), representing a clinically meaningful reduction in pain.
Effects of Daily Zinc Alone or in Combination with Other Nutrient Supplements on the Risk of Malaria Parasitaemia: A Systematic Review and Meta-Analysis of Randomised Controlled Trials
Nutrients (2023) · Meta analysis · n=1339
The effect sizes, represented as risk ratios (RRs) with 95% confidence intervals (CIs), were standardised by transforming them into log RRs and then pooling them using a fixed-effects or random-effects model depending on the heterogeneity across studies.
Prevalence of Zinc Deficiency in Inflammatory Bowel Disease: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis · n=806
Pooled analyses by the IBD subgroup showed a total population of 1677 with CD, for an overall mean zinc deficiency prevalence of 54% and 95% confidence intervals (CI) ranging from 0.51 to 0.56, versus 41% (95%CI 0.38-0.45) in the UC population (n = 806).
Zinc has a higher evidence score (8.5/10 vs 4.5/10) and wins in 3 of 3 categories.
For bone health, Zinc has a higher relevance score (70 vs 55).
In postmenopausal women an extra 468 mg calcium a day as calcium phosphate cut net zinc absorption by about 2 mg/day, and 600 mg calcium carbonate taken with a meal halved zinc absorption from it. Take zinc between meals and hydroxyapatite with meals, at least 2 hours apart. Consult a healthcare provider for personalized advice.
AREDS2 works for diagnosed AMD; lutein/screen-strain claims are weaker. Who actually benefits.
The popular one (saw palmetto) mostly fails in rigorous trials; beta-sitosterol is the better bet.
Selenium helps; iodine can WORSEN Hashimoto’s. The honest take on "thyroid support".
CoQ10, zinc, selenium, carnitine modestly help sperm parameters — but live-birth evidence is weak.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.