If you have had an estrogen positive cancer, we do not recommend you take Meno Magic. Meno Magic contains black cohosh, a herb that is thought to have selective estrogen receptor modulation activity, with studies suggesting an estrogenic effect on bone but not on breast or endometrial tissues. It also contains shatavari, a herb that has shown some oestrogenic effects in animal studies. Research has demonstrated that black cohosh does not increase risk of breast cancer in women with or without a history of this. However, many practitioners choose not to use herbs that may have some estrogenic effects for patients who have had hormone-sensitive breast cancer, in case of altered risk and safety.