Oyster extract has become a hugely popular supplement with bodybuilders; it is also achieving recognition amongst males outside the gym who simply want to improve their sex life or enhance their fertility.
Recent scientific studies suggest that zinc increases testosterone levels, and oyster extract is rich in zinc. Logically, then, an oyster extract supplement can enhance performance both in the gym and in bed. Little wonder that admiration is rising fast for this interesting and natural supplement.
Oyster extract and its testosterone boosting qualities
There is a growing literature proving that zinc supplementation dramatically increases testosterone levels, not only in the rats and mice used in early testing, but also in humans. In one study, 10 elite wrestlers who took a zinc supplement of 3mg/kg body weight per day for four weeks, were shown to have significantly increased testosterone levels at the end of the trial (http://www.ncbi.nlm.nih.gov/pubmed/16648789).
Similar impressive results were obtained when 32 cyclists were given zinc supplements (30 mg per day) for four weeks. This trial showed a substantial increase in testosterone after rigorous physical exercise (http://www.ncbi.nlm.nih.gov/pubmed/21744023).
In a clinical trial of zinc and magnesium supplements involving 57 highly trained footballers, not only were testosterone levels higher after 8 weeks of supplementation, but the muscle strength of participants was also significantly improved (http://www.asep.org/asep/asep/BrillaV2.PDF).
Whilst to date there has been little direct research on the testosterone-boosting effects of oyster extract, its high levels of zinc (around 3 mg per gram of powder) suggests that an oyster extract supplement could produce similar effects on testosterone production and synthesis.
Other proven health benefits of oyster extract supplementation
A study in Japan in 2009 showed that oyster extract, with its high concentration of zinc and other trace elements such as copper, iodine, selenium, manganese and cobalt, can produce dramatic improvements in people suffering from depression. These minerals were found to aid liver function, enhance IQ, improve body strength and provide protection against illness (http://www.japanclinic.co.jp/research/PDF/26_109.pdf).
A study on rats in 2006 concluded that oyster extract can produce a number of beneficial effects, lowering both cholesterol and blood pressure and possessing natural antihypertensive properties. Whilst there is no guarantee that similar results would be achieved in trials on humans, this rat study suggests that an oyster extract supplement may be valuable in maintaining and improving health and well-being.
An interesting study on mice in 2003 concluded that oyster extract can prevent and reverse various reproductive defects due to zinc deficiency. In particular, sperm motility was increased by introducing oyster extract into the diet and the mice became more fertile (http://onlinelibrary.wiley.com/doi/10.1111/j.1741-4520.2003.tb01013.x/abstract).
An exciting very recent scientific study on zinc supplementation concluded that zinc may help the human body’s response against cancer in patients with Type 2 diabetes and metabolic syndrome. (http://www.ncbi.nlm.nih.gov/pubmed/24403477). The study was small-scale, with just 17 patients, and clearly further research would need to be carried out for confirmation, but this study does suggest that zinc-rich oyster extract could have health benefits that extend way beyond those identified by previous clinical trials.
A note of caution: an extensive study carried out in the US on 46,974 men over a period of 14 years concluded that men who consumed 100 mg/day zinc supplement over 10 or more years had an increased risk of developing prostate cancer. Although further investigation of this phenomenon is required, those who are tempted by the potential benefits of zinc or oyster extract supplements should be aware of the possible risk of long-term use (http://www.ncbi.nlm.nih.gov/pubmed/12837837).
The growing scientific literature on oyster extract and zinc tend to support the claims that these supplements can significantly boost serum testosterone levels as well as producing other health (and social) benefits. The clinical studies on highly trained athletes have highlighted the specific benefits of the supplements for those who are involved in rigorous muscle training.
Trials on zinc supplementation and testosterone levels are to date far more prevalent than those on oyster extract, and for that reason it is sensible for anyone considering an oyster extract supplement for performance enhancement to ensure that the product they choose contains high levels of zinc.
Of course, the trials on oyster extract have demonstrated an impressive array of potential health benefits beyond increasing testosterone, which may be due to its impressive array of additional trace elements such as copper, iodine, selenium, manganese and cobalt as well as zinc.
Oyster extract is a natural product that offers a range of potential advantages to athletes and body builders. Providing it is not taken over a very extensive period it should prove entirely safe.
There are a number of supplements which contain Oyster extract as a key ingredient –
One of these is TestoFuel