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I've been playing around with raw Black Maca for a few months now, and doing some blood testing as well.
Initially I get a boost in libido and mood, but after a few weeks on Maca, my LH approximately doubles, FSH decreases slightly, my total testosterone decreases by about 15%, and my estradiol decreases by over 60%.
All the hormones remain in range except for estradiol which is down to < 40 in the last blood test. The reference range is 102 - 196.
I've checked this twice now, and both times the same pattern occurs with the blood results.
Something else is that after a few weeks on Maca, I get a feeling of a lump in my throat and a slight tenderness there. I had my TSH checked and it was 2.0, but I still suspect Maca may be interfering with my thyroid function. I can't say for sure without testing T3 and T4.
Could thyroid problems cause a drop in testosterone and increase in LH?
It's worth noting that raw Black Maca contains both iodine and glucosinolates.