Tongkat Ali na ɗaya daga cikin ganyen da ake yawan ambata a intanet wajen ƙara testosterone. Wani ƙaramar gwaji ya ba da sakamako mai jan hankali daga mutane 25 masu motsa jiki, shekaru 57‑72, waɗanda suka sha 400 mg na ƙwayar a kullum tsawon makonni 5. Duka matakin testosterone gaba ɗaya da na ‘yanci sun ƙaru, haka kuma ƙarfi a hannun su ya ƙaru. Mata ma sun ga ƙaruwar testosterone na ‘yanci, alama ga raguwar SHBG. Sai dai ba a sami ƙungiyar placebo ba, don haka sakamakon na iya ƙarfafa tunani amma ba hujja ta ƙarshe ba. Ga abin da binciken ya nuna, abin da ba zai iya faɗi ba, da yadda ake tafiyar da shi da hankali.
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