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A comment on Sunlight through glass does not provide Vitamin D. Parent comment

Re:Sunlight through glass does not provide Vitamin D by Johnny555 on Monday February 25, 2019 @11:17AM (#19246643)
USP and other certifications are supposed to address this, but the onus is on the consumer to seek out the certification label.

http://www.usp.org/verification-services/verified-mark

Others include NSF, UL, and consumerlab

https://www.consumerreports.org/vitamins-supplements/what-us...

There's still the chance that a manufacturing mistake could result in bad dosage but that applies to all products including medicine.

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Re:Sunlight through glass does not provide Vitamin D by learc83 on Monday February 25, 2019 @02:37PM (#19248659)
Vitamin D is particularly worrisome to me because a few milligrams is the difference between therapeutic and toxic.
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