It’s not against the law to manufacture cosmetics in your home. Keep in mind, however, that it’s your responsibility to manufacture products in an environment that will not cause them to become adulterated.
FDA does not have regulations specifying good manufacturing practices (GMP) for cosmetics. However, "Good Manufacturing Practice (GMP) Guidelines/Inspection Checklist" is a list of factors an FDA investigator will look at during an inspection. We have posted this list of GMP guidelines to alert firms to some factors to keep in mind when planning their manufacturing conditions and procedures. Even if you are manufacturing your products in your home or salon, these guidelines will help you keep your process and your products safe.
Here are some of the ways in which a cosmetic can become adulterated:
- Color additive violations: Misuse of color additives makes a product adulterated.
- Prohibited and restricted ingredients: Violating the restrictions on the use of these substances makes a cosmetic adulterated.
- Packaging: The composition of its container may make the contents "injurious to health."
- Microbial contamination: Cosmetics are not required to be sterile, but microbial contamination can pose a health hazard, making a product adulterated. (See “How must I test my products and ingredients?”)
- Other contaminants: Unwanted substances from a number of sources may adulterate a product.
- Any other problem that could make the product unsafe for consumers when they use it according to directions on the label, or as it is customarily used. (See the FD&C Act, Section 601)
Source: https://www.fda.gov/cosmetics/resourcesforyou/industry/ucm388736.htm#3
