re: spotinjections.com

22 or 23 Gauge, 1.5 Inch is ideal for injections into the glutes.

25 Gauge, 1.0 inch is ideal for injections into the quads and can be used for all spot injections.

25 Gauge, 5/8 inch is often used for tricep/bicep/delts

been using 22G for my delts, wanted to try the same into quad... is that too big for those areas or is the above just for reference?