The NIH sets a hard upper limit for vitamin D consumption at 4,000IU, or 100mcg.56 Calcium As with vitamin D, theres a risk of getting too much calcium from supplementation, with the NIHs upper limits set to 2,500mg for adults under 51 and 2,000mg for older adults.57 Collagen Collagen is generally very safe to consume, even in large doses
If you are preparing for surgery or a sedated procedure, your care team needs to know about all appetite, diabetes, and weight management medicines
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