I have used nebido the past year, castor oil etcetc. Pharma from Bayer. Injection method after breaking the amp is pre-loading several 29g to 30g syringes. Yes, it does take a bit pushing it thru the glute, how much am i injecting? TRT dose. i take it with a grain of salt when people compare seconds to seconds when it comes to injecting aas but bloodwork difference between oils do correlate, castor oil is thick, my respects to those who brew. i use to have a shakey hand, after a month, steady handed. i find no difference between bigger gauges, however, LONG-TERM scar tissue i would rather avoid so i go with a smaller gauge. 29g. 30g is maybe 5-10 seconds more with the needle in there. 29g is fine.
@OP i have not a clue of the quality of now brand castor oil, but please report back and update about it