The vast majority of steroids on the market today require injection in order to be effective. Some are daily injections, but others are every other day or even three times per week. Many people don’t really mind the injections, but there are plenty of people who have an aversion to needles and who would rather take their performance enhancers orally. With a Tbol only cycle, there are no injections necessary. Just keep in mind that a Tbol only cycle can be hard on your liver if you use it at high doses or for long periods of time, so use it per recommendations and consider taking milk thistle along with it.
I don’t think it will directly reduce prostate size, it simply won’t put you at risk of enlargement like Testosterone might. If the root cause of your prostate enlargement is from Testosterone, then the only way to mitigate that would be to come off of the Testosterone, lower the dose, or find another alternative method of combatting the problem. Indirectly it could reduce prostate size I suppose because you may be able to get away with a lower dose of Test alongside RAD-140 to achieve the same anabolic benefits as a higher dose of test on its’ own that would pose a higher risk of prostate enlargement.