Patrick (USA) on 05/02/2021:

I found an USP grade Sodium Thiosulfate from the below company in the anhydrous form and it is triple the price as the other form. It appears that the Pentahydrate form is lab grade / reagent grade and thus not as pure nor recommended as safe for ingestion. I welcome anyone's feedback on this.

www.sciencecompany.com/Sodium-Thiosulfate-Anhydrous-USP-Grade-500g-P17116.aspx

I have a heel spur that I want to soak it in a foot bath. Then I'd like to take it internally for general detox.

Thank you,

Patrick