The whole spot injection for increased size in a particular muscle has some true to it, it's not bro science. It will work but only if you use it in the same manner as synthol. When you inject the oil contained in the aas it will stretch the fascia, but only if you inject a high amount of aas about
4-8ccs in that particular body part per week. Again preferably the oil used in the aas should be mct witch is what synthol is mostly made of, also the shoulders have 3 heads so that's a lot of aas that's why it only seems to work for guys that are on high amounts of aas.