Found several reports of this combo in this forums "main 5-mapb" threads, and not sure if links are allowed but the reddit thread "
4-FA + 5-MAPB I'm in fucking love" reinforced my desire to try said combo
Anyways, I tried the borax formula in the following doses
20mg 2-fma, 50mg 5-mapb, 4mg 5-meo-mipt (this is the recommendation in his reddit thread). extremely underwhelmed
40mg 2-fma, 80mg 5-mapb, 5mg 4-ho-met. better. pretty close to rolling but i doubt i would ever have confused it with mdma
40mg 2-fma, 100mg 5-mapb, 4mg 5-meo-mipt. similar to above but preferred the 4-ho-met tryptamine. again, would not confuse with mdma
100mg 4-fa, 100mg 5-mapb. closest to an mdma roll i have ever felt. given a 2-3month break, i personally would be hard pressed to tell it was not real mdma if someone gave me a capsule containing this combo and told me it was mdma
this is just a subjective opinion with no scientific backing. maybe i just like 4-fa as a stim better than 2-fma. maybe it has some magic synergy. maybe i just need to use more 5-mapb in other combos instead of mixing it with another SRA