The body gets chloride (Cl⁻) from NaCl in trace amounts. In NaCl, Cl is tightly bound and stable. If you remember the chemistry class one of the most stable. Excess chloride can disrupt the body's delicate electrolyte balance, just like with other trace elements.

Garlic has arsenic in it. And garlic is used for health. You don't go and use industrial arsenic for that.