Even the term grass-fed can mean animals were fed grass pellets in a feedlot-type production model or were grazing monoculture grasses
I've still got a load of B12 Hydroxocobalamin ampoules that I bought from the lovely Versandapo a while back, but these had an expiry date of the end of April 2021
My personal view is that some of them need to be properly assessed in high quality clinical trials before finally dismissing their use
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Other factors, like bacteria that inhibit glutathione recycling in the lungs, can influence lung function