Oat Straw - Oatstraw (avena sativa) is known to nourish the nerves, making tactile sensations more pleasurable. Oat Straw is one of the best remedies for “feeding” the central nervous system, especially when under stress. Oatstraw is used to treat fatigue and exhaustion, Oatstraw improves brain and nervous system function and has been used to treat impotence. It is extremely useful for aiding your body in recovering from exhaustion and correcting sexual debility.