[albroland]

100-125 should give you visual effects you'd expect based on your existing conception of hallucinogens.

If you don't care for visual hallucinations, anywhere from 50-75 will give you a lot of the usually pleasant mental effects: high sense of novelty, mood elevation, curiosity, sense of openness, etc.

Even a smaller dose of 25-50 will give you perceivable mental effects.

You should also spend the bit of extra money on a reagent testing kit to ensure you aren't taking random research chemicals being passed off as LSD. You can keep the reagents in the fridge pretty much indefinitely for future use as well.