There is no reference nutrient intake (RNI) for red clover.
You should take one of the Nature’s Garden Red Clover Blossoms with Vitamin B6 430mg 100 Capsules three to six times daily, preferably with meals.
If you find it difficult to take tablets, or you just prefer not to take them, then the Herbal Authority Red Clover Liquid Extract 500mg is a great alternative.
Simply mix 1ml of the red clover liquid extract with a little bit of water and take this three to five times daily, preferably with meals.