Alternative to Regumate?

Is there a supplement or herb that could be used as an alternative to Regumate. My mares cycles are tough on her when she is not on Regumate but I’m not crazy about keeping her on it. If she is off it she is very uncomfortable and wrings her tail and bucks with urine flying everywhere. She is on Just Add Oats, & H2oil. Any ideas would be appreciated.
Mary P.

No replacement ..thank Goodness!   

I would increase the H2oil (perhaps another oz daily over the typical maintenance amount… the essential fatty acids are critical for hormone production) and add our RED CAL Hi Mag version as well.  The herbs in Heath Check may be beneficial too and sure worth the try.