Salt is needed.

It is a great disinfectant.  My GP told me about it.  Salt has been used for centuries.  Sailors use it.

I use it to rinse my mouth at bedtime.  It heals bleeding gums and tiny cuts and nicks on your fingers.

It is great for getting rid of acne scars, too.

I use cold water as an astringent.

Gargling with a salt solution helps sore throats.

It is needed to keep your blood pressure from becoming too low.  90 is low.  Below 90 is too low.  Anything under 120 is good.