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Castor Wax

Excipient (pharmacologically inactive substance)

Medically reviewed by Last updated on April 23, 2020.

What is it?

Castor wax (hydrogenated castor oil) is a hard, brittle, vegetable wax. Hydrogenated castor oil (castor wax) is also used an extended release agent; stiffening agent; tablet and capsule lubricant. Castor was is made by hydrogenation of pure castor oil, in the presence of a nickel catalyst. It is odorless and insoluble in water. In industry, castor wax is used in polishes, cosmetics, as a lubricant, and to impede moisture.[1]


[1] [1]Dave RH. Overview of pharmaceutical excipients used in tablets and capsules. Drug Topics (online). Advanstar. 10/24/2008 Accessed 03/27/2014

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.