Maca
WARNING
Buy gelatinized maca, not “raw.” Raw is both ineffective and indigestible. Raw maca powder cannot be swirled in water and drunk. It must be cooked first.
The first time I took maca, I felt very little focus increase and lots of ephedrine-style heart racing. And paranoid. And nauseous.
I now take it three times a day mixed with meal-replacement powder and 2 grams of kratom. It does strengthens the effort-part of focus.