Severe headache
Most Useful Review
I ordered this product for neuroprotection while on prescribed ADD medication, fearing long-term amphetamine neurotoxicity. Initially, I heard great reviews, but it caused serious side effects for me. I experienced a staggering headache, chest pressure, and nausea. After just 2 days, I had to stop using it, and today I feel fine, confirming it was indeed the PQQ.