This is like asking if the vitamins that you give to a chicken as a chick will poison you when you eat it as adult, I am not talking of hormones or growth agents, just literal common vitamins
You don't eat "the vitamins" you eat the chicken, you don't eat the fertilizer, you eat the plant
Life can create, modify, and break chemical bonds, but can't create, modify, or destroy elements. Vitamins can get metabolized into other compounds but mercury stays mercury.
You don't eat "the vitamins" you eat the chicken, you don't eat the fertilizer, you eat the plant