Vitamin D3 Breakthrough Halves Risk of Second Heart Attack
Postedabout 2 months agoActiveabout 2 months ago
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Vitamin D3Heart HealthSupplementation
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Vitamin D3
Heart Health
Supplementation
A study found that Vitamin D3 supplementation halved the risk of a second heart attack, but commenters expressed concerns about the prescribed dosage and potential toxicity.
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Nov 10, 2025 at 8:29 AM EST
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5,000 IU is most likely a daily dosage in this instance.
5000 IU is largely the minimum effective dose for supplementation. The FDA still recommends less than half of this, and it is a shame.
Disclaimer: I take 5k IU a day due to the past 2 decades of research on the efficacy.
Based research I've seen, for optimal wakefulness and cognitive ability, 50-60 is optimal, below 40 is too low, above 70 is too high.
You may have to adjust dosage over time to dial this in.
Just a reminder that you should get a blood test and advice from a medical professional before taking anything above the daily recommended amount.
[1] Evidence that calcitonin stimulates 1,25-dihydroxyvitamin D production and intestinal absorption of calcium in vivo.
https://pmc.ncbi.nlm.nih.gov/articles/PMC423580/