Royal Jelly: more testosterone and red blood cells
The larvae of bees grow into super-fertile, strong queen bees when fed Royal Jelly. Royal Jelly has a somewhat similar effect on humans too, according to studies like the Japanese one that had been published in Nutrition Journal. The Japanese gave Royal Jelly to adults aged between 42 and 83 for a number of months and observed that their testosterone levels and red blood cell synthesis increased.
The dose the researchers tried was on the high side. The thirty test subjects drank a daily 100 ml of fluid in which 3 g Royal Jelly had been dissolved [RJ]. A control group drank 100 ml of fluid without active ingredients [Control]. The fluid was administered for 6 months.
To start with the researchers watched for allergic reactions. Although the Japanese still regard Royal Jelly as a 'causative allergen' they observed no side effects in their subjects.
What the researchers noticed was a rise in testosterone levels. The Japanese speculate that this is a result of an increased conversion of DHEA into testosterone, but to be honest we don't buy this.
Secondly the researchers observed a slight increase in the Royal Jelly subjects' red blood count [RBC], combined with a concomitant rise in the blood haematocrit count [Ht]. Both effects are an indirect result of the increased testosterone level, according to the researchers.
The insulinogenic index [IGI] also increased as a result of supplementation. That means that the subjects started to make more insulin when they were given glucose: their insulin sensitivity increased. The researchers also ascribe this effect to the rise in testosterone level.
The research was financed by the Japanese government.
Nutr J. 2012 Sep 21;11(1):77.
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