Tetrasodium etidronate ek phosphonate-based chelating agent hai jo cosmetic formulations mein use hota hai. Ye metal ions ko bind karta hai aur product ke stability ko improve karta hai. Isse product mein discoloration, rancidity aur degradation se bachav milta hai. Basically ye ek formulation aid hai jo product ko fresh aur stable rakhne mein madad karta hai.