Ever since the days when snake oil salesmen crisscrossed the American frontier peddling miracle potions, unwitting consumers searching for a magic bullet have eagerly spent hard-earned cash on unproven drugs and useless concoctions. In the 1950s, hundreds of men and women suffering from various types of cancer turned to a horse-blood extract as the cure. The clinical evidence relied on animal models, but animals and humans may not react the same.
Individual people are different, too.
Piracetam and Hydergine can cause insomnia, nausea and other gastrointestinal distress, and headaches. Adverse reactions associated with Diapid include runny nose, nasal ulceration, abdominal cramps, and increased bowel movements. Vincamine should not be used by pregnant women or children because it can cause gastrointestinal distress. There haven't been enough studies conducted over a long period of time. Aniracetam, they say, works best if taken with choline.