Anti-aging effect of Royal Jelly boosts testosterone
We've written recently about the testosterone boosting effect of Royal Jelly on rabbits and rats. Researchers at the Japanese company Hayashibara discovered that Royal Jelly had the same effect in golden hamsters – and they discovered something that looks like a mechanism.
The androgenic effects of Royal Jelly are not a scientific novelty. Back in 1962 Japanese researchers discovered that when injected with ether extracts of Royal Jelly, rats and mice started producing more sperm. In 1988 other Japanese researchers repeated these experiments and observed that as a result of the injections "the weight of the testes, epididymides, seminal vesicles and prostate glands of male mice increased". [Tokyo Vet. Anim. Sci. 1988 35, 1-4.]
In 2004 researchers at Hayashibara wanted to find out whether Royal Jelly had the same effects when administered orally. So they gave 32-week-old golden hamsters Royal Jelly mixed into their feed for 12 weeks. One kilogram of feed for one group contained 50 mg Royal Jelly; another group was given 10 times this quantity. A control group got feed with no additives. The table below shows that the golden hamsters got 2.3 and 24.2 mg Royal Jelly per kilogram bodyweight each day. That's not a lot.