Having spent hours online reading Amazon reviews of supplements, I was happy to find a new, more analytical way to look at supplements recently. A website called Lab Door is testing supplements to determine their contents and posting the results for free.
Supplements in the US are not regulated by the FDA for their purity or potency, so it is always a bit of a leap of faith when buying a new brand of a vitamin or mineral. Lab Door is taking the mystery out of the buying process for quite a few popular supplements. They publish their results for free and then make money on Amazon associate sales.
Lab Door has reports for the popular brands of specific vitamins such Vitamin C and D, and it also covers broader categories such as BCAA and protein powders. Their report on fish oils includes heavy metal testing and a freshness test based on oxidation of the oil. They don’t cover every supplement and miss quite a few that I would love to see, but it looks like they have quite a few more reports in the pipeline.
I have no affiliation with the company, just an appreciation of the information they are providing!