Hi, I had a mastectomy for DCIS in November 24, radiotherapy end of January, I used to take collagen and magnesium aswell as black cohsh, can I take these again along with any other vitamins?
If you aren’t on any hormone blockers then ’ as you were’ probably applies. There might be a conflict with black cosh and tamoxifen, however - not sure on other AI’s. Your other stuff is probably ok.
Ah, sorry, should add, I’m not a BCN, they will probably reply more comprehensively on Monday. ( just realise you are on the ask nurses thread)
Hi Carrie. Well done for getting through it all - it’s not an easy journey. I would like to know about collagen too. I was taking hydrolised Marine collagen 2 years before my diagnosis and I convinced myself that it might have caused it. I have no real basis for this, other than the fact that it was the only thing I introduced into my life at that time. I am now too scared to take any supplements other than D3. 
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Hello carrie2402
Thank you for posting.
Many people ask about vitamin and herb supplements as they want to do as much as possible to be healthy. It is understandable that you would want to go back to taking magnesium, collagen and black cohosh.
There is often the belief that vitamins and herbs are safe as they are considered natural, but there is still much we don’t know about supplements and herbal remedies. Herbal treatments don’t have to comply with the same regulations or rigorous testing that conventional medicines do. For many products there is a lack of research to support their use, and some can interfere with conventional medicines including cancer treatments.
As @entroppy says black cohosh isn’t recommended for women who have had breast cancer and more evidence is needed to learn if it is safe for them to take. You do not say why you were taking it, but NICE guidance recommends that black cohosh should not be used to treat menopausal symptoms in women who have had a diagnosis of breast cancer.
It isn’t possible for us to say if it is safe to take collagen supplements. There is research looking at collagen levels and breast cancer, but it is not clear yet if this means that collagen supplements should be avoided.
You might find it helpful to search this American website, Memorial Sloan Kettering Cancer Centre, for information about individual herbs and vitamins. Each entry has sections on existing evidence and what known interaction there is with other medications. You may find that that some herbs have different names in America. You can also search herbal products and supplements on the European website Complementary and Alternative Medicine for cancer and on the American website Medicine Plus
It’s important that you speak with your breast care nurse, treatment team, GP, or a pharmacist before starting to take any previous or new supplements.
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