D-threitol is used as an antifreeze.

Tuftsin diacetate, a tetrapeptide, is a macrophage/microglial activator. Tuftsin is a tetrapeptide, Thr-Lys-Pro-Arg, which resides in the Fc-domain of the heavy chain of immunoglobulin G. Tuftsin possesses a broad spectrum of activities related primarily to the immune system function and exerts on phagocytic cells, notably on macrophages.

3-Hydroxyanthranilic acid also known as 2-amino-3-hydroxy-benzoate or 3-ohaa belongs to the class of organic compounds known as hydroxybenzoic acid derivatives. 3-Hydroxyanthranilic acid has been found in human epidermis and bladder tissues and has also been detected in multiple biofluids such as urine and blood.