Huckleberry Hiker:
Ever since the night of August 13, 1967, when two women were attacked and killed by grizzly bears in two separate incidents in Glacier National Park (which was later chronicled in Night of the Grizzlies), a myth has persisted that women may be more prone to bear attacks as a result of odors associated with menstruation.
However, according to a paper recently published by the National Park Service, “there is no statistical evidence that known bear attacks have been related to menstruation”. …
Myth Busted: Women are more prone to bear attacks due to menstruation odors
More detail on that research.

