Remedy

Def. "a medicine, application, or treatment that relieves or cures a disease" is called a remedy.

Cures
Def. a "method, device or medication that restores good health" or an act "of healing or state of being healed; restoration to health after a disease, or to soundness after injury" is called a cure.

Medicines
Def. a "substance which specifically promotes healing [when] ingested or consumed in some way", a "treatment or cure" , or the "study of the cause, diagnosis, prognosis and treatment of disease or illness" is called a medicine or medicine.

Nutraceuticals
Def. a "nutrient or food believed to have curative properties" or a "food used as a drug" is called a nutraceutical.

A nutraceutical or 'bioceutical' is a pharmaceutical alternative which claims physiological benefits.

In the US, "nutraceuticals" are largely unregulated, as they exist in the same category as dietary supplements and food additives by the Food and Drug Administration (FDA), under the authority of the Federal Food, Drug, and Cosmetic Act.