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
Calcium and Hydroxyapatite (MCHC) can interact. Total calcium can pass the 2,000-2,500 mg/day upper level once diet is counted. In the Women's Health Initiative, 1,000 mg calcium plus vitamin D a day raised kidney stone risk by 17%. Do not take both by default. Count the elemental calcium in each product plus diet and stay within the upper level. With the 700-1,300 mg/day RDA partly met by diet, many adults need no more than 500-600 mg/day from supplements.
Total calcium can pass the 2,000-2,500 mg/day upper level once diet is counted. In the Women's Health Initiative, 1,000 mg calcium plus vitamin D a day raised kidney stone risk by 17%.
Hydroxyapatite (MCHC) is itself a calcium supplement, so taking it with another calcium product stacks the same mineral
What to do: Do not take both by default. Count the elemental calcium in each product plus diet and stay within the upper level. With the 700-1,300 mg/day RDA partly met by diet, many adults need no more than 500-600 mg/day from supplements.
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.