Hi & Welcome. You can these supplements along with Letrazole. Letrozole is an aromatase inhibitor which is primarily used in the treatment estrogen receptor positive breast cancer in post-menopausal women. It decreases the amount of estrogen the body makes and helps to slow or reverse the growth of these breast cancers. Since due to lack of estrogen it can decrease the density of your bones (osteoporosis) and increase the chance of broken bones and fractures. You can take those supplements that are useful in prevention of osteoporosis. They do not cause any harmful interactions with Letrazole, hence can be taken safely along with it. Hope these answer your query.