There are some tips that Ms. Vitti dispenses somewhat universally: Eat fermented foods like kimchi and sauerkraut to help support your microbiome; avoid consuming large quantities of sugar; and eliminate dairy, which she sees as a root cause for issues like PCOS, acne and endometriosis.

Ms. Vitti does not have a medical degree. After studying for two years at the Integrative Institute of Nutrition, a licensed vocation school, she quit a job in marketing and apprenticed for a few years with alternative medicine practitioners. In 2000, she started her own walk-in clinic in Manhattan . By 2010, she said she was seeing around six patients every day, often during after-work hours, and receiving hundreds of emails from women in Europe and India seeking her advice. That year, she closed the clinic to focus on expanding the practice into a digital brand.

Dr. Elizabeth Fino, a reproductive endocrinologist and infertility specialist at the New York University Langone Fertility Center who is familiar with Ms. Vitti’s work, agrees that diet and lifestyle shifts should be the first line of treatment for women facing hormonal issues like PCOS. But she also believes that modern medical treatment — for example, taking birth control to regularize periods — is often the best and most realistic option. (Ms. Vitti is pro birth control in general, but does not encourage it as a treatment for existing hormonal imbalances.)

“Her approach takes significant dedication on the patient’s part, and it’s just not attainable for a lot of people,” said Dr. Fino, noting how expensive and time consuming it can be to follow a clean eating regimen. Ms. Vitti’s supplement kit, for example, which includes a 60-day supply of five different supplements including fish oil and magnesium, costs $215. That’s about $1,200 a year.

The language Ms. Vitti’s employees use is pulled from “WomanCode,” a book she published in 2013. Referred to by fans as “the purple period bible,” the book offers women alternative strategies for dealing with tough hormonal issues, including endometriosis and cystic acne.