Third party testing was said to be unnecessary for synthetic supplements.

I was hoping to get heavy metal results for products from NootropicsDepot, but apparently they don't test synthetic products:

" Thank you for reaching out to us. Unfortanatly, we do not test for heavy metals in synthetics like "Aniracetam or Oxiracetam". The reason being is that synthetic products do not need heavy metal testing because they are not grown in soil, unlike natural products. We test natural products for heavy metals because we don't know what kind of soil the plant is being grown in and what the plant is absorbing from the soil. Plants and other natural biomaterials can have trace amounts of heavy metals in their composition, thus making it necessary to perform additional testing on these products. "

Also the results for the supplements they do test only show "<2ppm" on lead which seems too imprecise, considering how detrimental lead can be a low doses. Is this really a good reason to not do third party testing? Virtually all products that provide an accurate certificate of analysis have a measurable and meaningful amount of lead shown. Is imprecise testing for heavy metal in natural products and no testing at all for synthetic products really ok?

Edit: Seems lik…