Livelong Icariin

Livelong has a solid reputation, to my knowledge. Just wondering about Icariin and the effects of 40%.
 
40-60% seems to be the ideal extract range for positive effects, seems anything higher(70-98%) or lower (<20%) are less effective/have negative sides.

Plan to use this soon as well, same product.
 
40% was in Tropinol XP, and I didn't feel anything. Then again I highly doubt iForce used an equivalent dose.
 
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