This treatment is sometimes used, mainly in cases where symptoms are severe and not helped by other treatments. It is done using a series of injections of the allergen causing the rhinitis, in increasing quantities. The idea is that your immune system will become desensitised to the allergen. This means that the allergic response that your body mounts when it is exposed to the allergen in the future is reduced, so improving your symptoms. Another technique is being developed which involves placing the allergen under the tongue. However, this may not yet be widely available.
Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
Another similar method that’s becoming popular is to use SARMS S-4 as a “mini-cycle” in-between steroid cycles. In other words, once you finish your course of steroids and do a proper PCT and settle into being “natural”, after a while you can use SARMS S-4 daily for a 4 week run. In this way you can bump up gains, increase muscle density, improve lifts and burn fat – all without deregulating androgen receptors or compromising the HPTA. (Hypothalamic Pituitary Testicular Axis)(7). Never before has this been possible.