A staple of my nootropic arsenal. Packing is clean. This is ideal as it doesn't create a dependency but still helps.

The label is also deceptive in how it shows ps 100mg/20%. Gave me a headache after taking it four days in a row.

Threw it out. No bueno. Second time, it changes. I wish i were joking but it's not a joking matter.

The 500mg per tablet is only guaranteed to contain 15mg. But this is true of almost all amazon reviewers. Guaranteed potency was only for 15mg - no, that is not a typo.