This is why it’s so very important to know the source of your supplements. Standard Process supplements are controlled from seed to seal so we KNOW there are no harmful ingredients. Most chiropractic offices carry Standard Process supplements. If you are taking suppies from WalMart, grocery stores, GNC, The Vitamin Shoppe or drug stores, you better do your due diligence on what you are taking.
There is one well known and heavily advertised “senior” supplement out there with antifreeze in it. The labeling laws make it very easy to hide ingredients.