I didn't record the source, but I read somewhere that ``However, excessive intake is not good.'' US upper limit 4000IU = 100μg/day, Japan upper limit 2000IU = 50μg/day, The average weight of an American man is 80 kg, a Japanese man is 65 kg, and I am 53 kg.
It is known that continued intake of large amounts of vitamin D can cause hypercalcemia, kidney damage, and soft tissue calcification disorders.
Two studies on vitamin D safety came out in 2020 and 2023, showing how thousands of international units of vitamin D, even when taken for years, did not cause undue harm. Here are citations:
I didn't record the source, but I read somewhere that ``However, excessive intake is not good.'' US upper limit 4000IU = 100μg/day, Japan upper limit 2000IU = 50μg/day, The average weight of an American man is 80 kg, a Japanese man is 65 kg, and I am 53 kg.
It is known that continued intake of large amounts of vitamin D can cause hypercalcemia, kidney damage, and soft tissue calcification disorders.
Masaki,
Two studies on vitamin D safety came out in 2020 and 2023, showing how thousands of international units of vitamin D, even when taken for years, did not cause undue harm. Here are citations:
PMID: 31746327
PMID: 36853379
Thank you Deep.