Q. Is it possible to create formulas based on homemade shampoo recipes?

Answer

If you want to build it yourself you can do so as long as you do your homework and have it verified or test it yourself (if you know how to culture cells). If you want to create anti-dandruff shampoos or shampoos containing medical formulations you'll need to get them tested by a third party because they're regulated as OTC medications in the United States.