Evidence from rat studies suggests that boron may be able to raise testosterone levels. How this occurs is not fully understood. However, boron is known to be required for the synthesis of steroid hormones including testosterone. This then may explain why administration of boron in drinking water to rats increases testosterone. The same administration of boron also increases vitamin D metabolite levels, vitamin D also being a steroid hormone. Boron may therefore alter the synthesis rates of steroid hormones and in this way may have an influence on blood levels of testosterone. However, it is unclear as to the effects of boron supplements on testosterone levels in humans. Rats have different nutritional requirements and although physiologically similar in some ways, their metabolism is quite different in others. It is also unclear as to whether boron supplements support testosterone synthesis through correction of boron deficiency, or alternatively through a pharmacological (drug-like) action.
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