> Many homeopathic products actually contain a sufficient amount of the active ingredient that they absolutely can conceivably have a significant biological effect

On the upside, "the risk of bioaccumulation of metals/metalloid from the homeopathic medicines seems to be rather low, due to small quantities of those products prescribed to be applied per day, as well as insignificant metal contamination of the majority of tested products" [1].

[1] https://pubmed.ncbi.nlm.nih.gov/20674842/