Part 9/14:

• Differences between forms: Vitamin D3 from supplements is not biologically active upon ingestion; it must be converted in the liver and kidneys to its active form. Sun-produced vitamin D3 undergoes this process naturally, often more efficiently.

The Cultural Bias and Misconceptions

Our perceptions of sunlight and tanning have evolved. Historically, pale skin signaled privilege and a life spent indoors, protecting oneself from laborious outdoor work. Conversely, a tan was associated with lower social status. Now, in the US, a tan often signifies leisure, affluence, and health.