Health: Use oat straw as a nervous system restorative and to strengthen a weakened constitution, as well as to treat genital herpes and shingles. There is no doubt that the silicic acid in the herb is soothing on skin. What about the use of oat straw as a sexual stimulant? A single scientific study a number of years ago found that oat straw stimulates the release of luteinizing hormone in rats. There is no scientific evidence that oat straw has an effect on the human body's use of testosterone. On the other hand, there is no conclusive scientific evidence that it doesn?t.