Thymulin

How it works

Inactive without its zinc atom, this thymus hormone is sold in vials as a way to rejuvenate an aging immune system.

What it's made of

9 amino acids made by the thymus. Without a zinc atom it does not work: in 1982, Jean-François Bach's team named it when they found that zinc activates it.

What it's for

Prescribed for

Nothing.

Sold as

The thymus hormone to rejuvenate the immune system.