AFAIK it has not been proven if it breaks down into lsd-25 of if 1p itself fits into the 5-ht receptor as it’s own in vivo.
>It has been theorized that 1P-LSD may act as a prodrug for LSD. While 1P-LSD shows only 38% the potency of LSD in mice, LSD is detected via LC-MS when 1P-LSD is incubated in human serum. Follow-up studies are currently being conducted to compare the affinity and selectivity of LSD and 1P-LSD at 5-HT receptors, and to determine whether 1P-LSD is hydrolyzed to LSD in vivo.[1] Otherwise, it is possible that 1P-LSD may be capable of exerting its own psychedelic effect.