Magnesium chloride (MC) has many potential health benefits and in the link to the full study below it is suggested that breast cancer might be one.
In the study they compared the effects of MC with cisplatin. The cisplatin was more effective and comes with side effects and can only be given for so long, whereas MC can be taken indefinitely and side effects are more likely to be other health benefits. Being replete with MC may be a safe and effective preventative or it may be a great addition to a breast cancer treatment strategy. Definitely worth the read and consideration.
Here is a link to the full study: