PCOS is a hormonal disorder thought to affect between six to 12% of US women, where the ovaries produce unusually high levels of hormones called androgens (known as hyperandrogenism). People with PCOS may have small cysts on their ovaries, irregular periods, insulin resistance, excess hair growth, and infertility.
The following supplements can help to alleviate symptoms and treat underlying causes.
Inositol which is a type of sugar found in the body, is the main supplement that is recommended to patients with PCOS. Inositol supplements are thought to restore the correct ratio of inositols in the body, helping to reverse some of the signs and symptoms of PCOS. Cleveland clinic states as well as improving blood sugar levels, inositol can reduce blood pressure and promote ovulation in people with PCOS.
Clinical trials in people with PCOS suggest that cinnamon may reduce their insulin resistance, testosterone levels, and weight, as well as help regulate their menstrual cycles.
Calcium and vitamin D show promise for improving PCOS symptoms such as irregular menstrual cycles, high testosterone levels, and hirsutism (excessive hair growth). Finding however stipulate that these improvements aren't solely from calcium and vitamin D supplementation — instead, they act in synergy with metformin and other micronutrients such as magnesium, zinc, vitamin K, and vitamin E.
Zinc could help insulin resistance in women with PCOS, according to a 2020 review of studies, but it's unclear whether it helps with hormonal balance.
Spearmint has been shown to be helpful with some of the androgenic symptoms of PCOS, such as the acne and the facial hair, however studies have been small and short therefore more research is necessitated.
Ref:
https://my.clevelandclinic.org/health/drugs/25173-inositol 
