TGA warns black/red salves promoted for cancer are unapproved, unproven, corrosive, and can cause serious skin harm.
Black Cohosh
Herb used for menopausal symptoms and sometimes by breast-cancer survivors, but also promoted beyond evidence. Black cohosh is commonly used for hot flashes and menopausal symptoms. Cancer Research UK says there is no scientific evidence that black cohosh treats or prevents cancer; hormone-sensitive cancer contexts require care. PROS May help some menopausal symptoms in non-cancer contexts.
Cancer Research UK: black cohosh has no scientific evidence for treating or preventing cancer; used mainly for menopausal symptoms.
FDA page on illegal cancer products and warning letters; includes black-salve/fake cancer-cure safety context.