Let’s say we take the benefits of D supplementation at face value. How do you get a hold of some that you can be confident is actually what it says it is and we

Let’s say we take the benefits of D supplementation at face value. How do you get a hold of some that you can be confident is actually what it says it is and well-formulated for bioavailability, given reports that it’s common for what’s sold in stores to be dodgy? https://well.blogs.nytimes.com/2015/02/03/new-york-attorney-general-targets-supplements-at-major-retailers/ https://well.blogs.nytimes.com/2015/02/03/new-york-attorney-...