also here's two doctors discussing the reasoning and how to achieve 100ng/ml https://youtu.be/2hO7fniCbmw?t=139 https://youtu.be/2hO7fniCbmw?t=139 you can rewi

also here's two doctors discussing the reasoning and how to achieve 100ng/ml https://youtu.be/2hO7fniCbmw?t=139 https://youtu.be/2hO7fniCbmw?t=139 you can rewind, but the timestamp is where that discussion starts. If you don't have time; partially an IU of D is the amount a 10 gram mouse needs, daily. So a 60kg human needs 6000IU, daily. Overweight people need more, underweight people need less. This was discovered ages ago (several decades).