Avena Sativa herb, oats extract benefit for sexual enhancement, how well does it work?
Avena sativa extract is available as a supplement

Avena sativa is the scientific name for the grass commonly known as oats. This extract from oats has mild aphrodisiac benefits, but there are more potent herbs or herbal formulas available to improve sexual function and pleasure.

Avena Sativa supplement 200 mg, 5:1 extract

Supplement Facts:
Serving size: 1 capsule
Servings per container: 60

Amount Per Serving:
Oats (Avena sativa) - 200 mg
   5:1 extract - about 5 times as potent as regular avena sativa powder  

Passion Rx with more than a dozen aphrodisiac herbs and extracts
Highly Effective Medical Doctor Formulated Sexual Pleasure Pills ideal for Men and Women who have a low libido and also for those who wish to enhance a normal sex life to new heights of Passion Rx for impotence. After years of research, Ray Sahelian, M.D., author of Natural Sex Boosters, has formulated Passion Rx, a libido product that has a powerful effect on sex drive, desire, and performance. Passion Rx has a combination of several sex-enhancing herbs, (including avena sativa) mixed in the right combination, extract potencies, and dosages to provide all day sexual enhancement. You'll be pleasantly surprised. The herbs include tribulus terrestris, avena sativa, ashwagandha, horny goat weed, Cnidium, Muira Puama herb, Tribulus herb, Tongkat ali, and Yohimbe extract. This product does not contain xanthoparmelia lichen.

Claims regarding Avena Sativa herb and extract
Promoters say avena sativa frees up bound testosterone to free testosterone in the blood, making it more active as a natural enhancement pill. However, I have not come across any published studies that prove this point, nor have I come across any studies published in the medical literature regarding the effectiveness of avena sativa as a sex booster or as a treatment for erectile dysfunction.

Most claims for avena sativa rest on research conducted during the 1980s by the Institute for Advanced Study of Human Sexuality in San Francisco, which markets a line of avena sativa products. According to an article in Nutrition Action Healthletter, the one study on men and women that compared avena sativa to a placebo was never published in a peer-reviewed journal. Institute head Ted McIlvenna, says "in part because we didn't want our competitors citing it to sell their own products." But that hasn't stopped erroneous accounts of the research from circulating.

Yet when you analyze a summary of the study provided by McIlvenna, it's impossible to tell whether there was any meaningful difference between the avena-sativa-takers and the placebo-takers. One finding was clear, though. The 25 women who completed the study did better on the placebo. McIlvenna says that as a result of the study, the Institute reformulated its product for women. But he declined to release the details of a second study, in women only, that he claims shows that the reformulated product works.

Avena sativa herb questions
Can avena sativa be used safely by someone with high blood pressure?
    We have not seen any human studies that have evaluated the influence of this herbal extract on blood pressure, so we don't know. Generally if a person uses low dosages of herbs, there is little likelihood of any significant influence on blood pressure.

 Has there been an avena sativa study for sexual improvement since 2006 in humans?
     We cannot find such a study.

Which is more potent, avena sativa or tongkat ali? What about deer antler velvet, is it potent?
    The latter two are more potent.