On: Sunlight through glass does not provide Vitamin D

[kortilla]

It is required. Just claiming something is well-known to counter someone’s suggestion without providing any evidence isn’t very productive.

[jimmy1 → kortilla]

No other suggestion was offered in the post I am referring to, just a "sources pl0x" ask. Here is the simplest counter example I can think of.

"Gravity is real."

"Reputed and trustworthy citations from scientific sources required, please."

You can get less and less ridiculous from here ad nauseam, but the point is made.