Best way to go IMO. Esp if the oil is MCT, draws faster. Most age mgmt HRT are going with sub-Q. I call it shallow IM. Upper glute or anywhere for that matter, but be consistent. 27g 1/2" pin, insulin w/no hub loss. Been doing it for HRT for years, works just the same as IM, most others I know are doing the same with HRT or pinning PEDs. Hardly feel the needle, less PIP, if the product should be contaminated the infection is much closer to the surface, no scar tissue. Be careful with true sub-Q just under the skin, a couple have developed cyst like structures. I prefer shallow IM.
Same here but strictly sub-q. I have done primo e, tren and tren a. Also do test u made with castor oil. Never had a problem.
Here is a study on this:
Al-Futaisi AM, Al-Zakwani IS, Almahrezi AM, Morris D.
Subcutaneous administration of testosterone. A pilot study report. Saudi Med J. 2006 Dec;27(12):1843-6. PMID: 17143361.
Conclusion: Therapy with weekly subcutaneous testosterone produced serum levels that were within the normal range in 100% of patients for both peak and trough levels. This is the first report, which demonstrated the efficacy of delivering weekly testosterone using this cheap, safe, and less painful subcutaneous route.
Testosterone E was used (200mg/ml) bottle warmed 5 minutes prior to injecting. Starting dose was 25-50mg/wk and adjusted after blood testing. The mean dosage was 55mg and a range of 25 - 100mg/wk. Sub-1 injections were well toletated and no side effects were reported.
Here is another one:
Kaminetsky JC, McCullough A, Hwang K, Jaffe JS, Wang C, Swerdloff RS.
A 52-Week Study of Dose Adjusted Subcutaneous Testosterone Enanthate in Oil Self-Administered via Disposable Auto-Injector. J Urol. 2019 Mar;201(3):587-594. doi: 10.1016/j.juro.2018.09.057. PMID: 30296416.
Conclusions: The dose adjusted subcutaneous testosterone enanthate auto-injector demonstrated a steady serum total testosterone pharmacokinetic profile with small peak and trough fluctuations. The device was safe, well tolerated and virtually painless, indicating that this subcutaneous testosterone enanthate auto-injector offers a testosterone delivery system that is a convenient weekly option to treat testosterone deficiency.