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25.02.2010


Onion juice triples testosterone levels

Think of a dirt-cheap vegetable you can buy at every greengrocers and supermarket. Put it in a juicer, give the juice to rats for three weeks, and watch their testosterone level rise by 314 percent. According to research done at Tabriz University in Iran, fresh onion juice raises testosterone levels as much as substances like nolvadex or clomid.

Quercetin

Esorhamnetin

In Iran many men who have fertility problems can’t afford to buy medicine. That’s why Iranian researchers are looking for alternatives to medicines like NAC and selenium. Studies show that antioxidants can increase production of testosterone and sperm in the testes. Studies have also shown that onions contain strong antioxidants. So the researchers put two and two together and bought ordinary onions – Latin name Allium cepa – on the market. They peeled the onions and put them in a domestic juicer made by Tefal. The juice they got is what they used in their trials.

Their subjects were a group of 8-week-old male rats. Of these, 10 were given ordinary food for 20 days. [Control] Ten other rats got 0.5 g per kg bodyweight of onion


juice, which was pumped into their stomachs using a tube. Another 10 rats were given the same treatment, but got 1 g/kg bodyweight/day.

The table below shows that after 20 days the onion juice had improved the sperm quality and increased the concentration of LH, FSH and testosterone in the rats’ blood.







Malondialdehyde is a mutagenic substance that is produced when free radicals damage the unsaturated fatty acids in cell membranes. The reduction in malondialdehyde concentrations that the researchers found indicates how the onion juice increases testosterone production: antioxidants in onion juice neutralise free radicals in the testes. The researchers suspect that the antioxidants in question are probably selenium compounds found in onions, and phenols such as quercetin and isorhamnetin [structural formulae shown above]. Isorhamnetin is also made in the body when enzymes convert quercetine with the help of S-adenosylmethionine.

The Iranian findings are not completely new. As long ago as 1967 an Egyptian researcher discovered that the testes of lab animals fed raw onion juice increase in size. At the moment there are quite a few animal studies which report that high doses of polyphenols like quercetin have a positive effect on the testes. But the effect of these is not as big as that of plain onion juice.

Source:
Folia Morphol (Warsz). 2009 Feb; 68(1): 45-51.

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