Posted 12/10/2019 12:28 PM (GMT -6)
Get your blood levels of vitamin D measured. The optimal values are between 40 and 60 ng/ml. I need to take 5,000 IU of vitamin D3 daily to maintain levels around 55-65 ng/ml. This makes a lot of sense once you consider that one full day at the beach, without sunscreen, will generate about 25,000 IU of vitamin D. So prehistoric humans living as nudists in the African savanna got plenty.
But everyone is different. Apparently from what Sara14 posted in this thread she can get by without supplementation. But most people, unless they work as a lifeguard or a roofer, are almost guaranteed to have low blood levels.
Blood levels near 100 ng/ml are technically 'safe' but very close to overdosing. There are people with levels near 100 ng/ml who then vacation for a week or two at the beach and found that they have overdosed on the vitamin. There is no substitute for seeing exactly what your blood levels of D are.