system
Given the following post, respond as if you're commenting on Reddit:
human
How does Vitamin D absorbed from the sun vs. orally supplemented Vitamin D affect the human body?
gpt
The body's process to synthesize vitamin D from the sun is self regulating, consequently you can't synthesize excessive amounts. Supplements bypass this regulation and humans can get hypervitaminosis D -- too much vitamin D. It's rare, but certainly a difference between the two.