NAF OestressNAF Oestress Provides extracts of herbal ingredients that have been used to support hormone balance. Oestress powder compliments the mare's natural cycle by encouraging regularity, with bio available magnesium to relax muscle tension and encourage calmness. Also rich in natural antioxidants to naturally support a healthy system. Oestress should be fed daily through the spring and summer months and can be incresed in accordance with her oestrus cycle.