Stearic acid, also known as Octadecane acid, is one of the most common long-chain fatty acids and exists in combination in natural animal and vegetable fats. Commercial "stearic acid" is a mixture of approximately equal amounts of stearic acid, Palmitic acid and a small amount of oleic acid.

Although it may be safe to use stearic acid in the form of Coconut oil or Shea butter, it is not safe to use pure stearic acid. According to NLM, the pure form of this chemical substance may lead to:

Skin allergies
Severe eye irritation
Severe eye damage
Respiratory irritation

In addition, substances naturally containing stearic acid may not be suitable for everyone.

For example, a study in 2021 shows that coconut is the most common Food allergy in commercial skin care products. Some people may experience allergic reactions through skin contact with coconuts. Therefore, people who are allergic to coconut should consider avoiding using skin care products containing Coconut oil products.

If people are concerned about allergies, they can consider consulting a doctor or dermatologist.

How to use stearic acid

People should follow the manufacturer's instructions when using products containing stearic acid.
People should also consider conducting patch tests before using products containing stearic acid for the first time. Patch testing should help indicate whether a person is allergic or sensitive to the product.

One can also consider seeking further advice from a doctor or dermatologist.

Stearic acid is a common skincare ingredient. For many people, using products containing stearic acid is a safe and effective way to treat various skin problems.

However, using pure stearic acid (what is stearic acid) can have side effects. In addition, products containing stearic acid may not be suitable for certain allergic individuals.

A person should consider consulting a doctor or dermatologist for further information.