[Quinner]

A tab is roughly a standard dosage. One problem is that LSD is such an extremely potent chemical (the effective dose is measured in micrograms) that it is difficult to be confident in your dosage when it hasn't been produced in a rigorously controlled pharma environment. So even one tab might be actually several times stronger than you're expecting.

I've seen bad trips, I've even seen one case of psychosis. My personal opinion is that the positives still outweigh the negatives. The negatives are also easily mitigated by providing a safe and positive setting (and would be even more so with standardized production); clinical administration would be quite safe. Benzodiazepines are effective in stopping the anxiety spiral of bad trips.