depends on what that gains consist of - muscle, fat or water. dbol is notorious for letting users store a lot of water because it converts readily to a potent form of estrogen. This water weight is completly lost after cycle.
The muscle and/or fat you gained (which depends on diet and training) is likely to stay after cycle. Usually in a short 4-6 week cycle the additional water weight is greater then the muscle mass gained. Muscle takes plenty of time to grow while water is retained almost overnight. Now, some users use the scales to measure their development and since they lose a great deal of (water) weight after cycle they conclude that dbol gains evaporate readily. It's unreasonable to expect 10 pounds of gains off a month long dbol cycle; 1-2 pounds of muscle mass would be reasonable (if you are not a beginner) and this will be achievable with a dbol-only cycle. Non-aromatizable AS like winny or oxandrolone don't let you store additional water and after cycle you don't lose that much weight as with dbol but you will not gain much weight at the first place, so results are comparable at the end.
the most important reason why one should prefer injectables like test or deca over orals is that you are limited with orals in length and dosage because of their liver toxicity.
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