Father has a secret recipe for treating cough, but there is no standardized and effective written information. Can he apply for a patent? How to apply?

Ancestral secret recipe itself can be patented and obtained, but I don't recommend you to apply for a patent.

Patents are protected by the disclosure of technical contents. When applying for a patent, you should disclose the formula, dosage, preparation method, usage method, effective dosage, etc., so that you have no secrets to protect.

Legal operation is mainly through drug registration, but only in the name of legal person, and the cost is extremely high, and clinical trials may be needed, at least several million.