If it's effective you only need one.

If you've taken a second one it's ineffective.

If you've taken it a third time it's ineffective

If you've taken it a fourth time it's ineffective

If you've taken it a fifth time it's ineffective and you're completely stupid.

Even taking one is pretty stupid without knowing the ingredients without knowing the trials and tests without having any information it's really stupid to take something you know nothing about sounds like you need a divorce remove yourself from this idiot bad company corrupts good character save yourself.