The Oxandrolone hormone does not carry any estrogenic related side effects. It does not aromatize and cannot lead to gynecomastia or water retention due to increases in estrogen levels. It further carries no progestin related activity, which again supports no estrogenic related side effects. Due to water retention being impossible with this steroid, this will decrease the risk of high blood pressure. Excess water retention can promote high blood pressure. Some steroids that do not aromatize can lead to high blood pressure, such as Trenbolone , but Anavar is rarely associated with this trait.
Another positive effect of deca-durabolin was reported by many bodybuilders who prior using this drug experienced pains in joints but once using it they started to enjoy training with no pain and that is attributed to deca’s ability to store more water in connective tissues.
However there are some moments which must be known by you before you start using nandrolone decanoate , it has a very strong effect on decreasing your sexual drive and it can cause gyno in some individuals. So have Nolvadex (tamoxifen citrate) on hand in case you feel gyno symptoms.
At 21 all you are doind is replacing your natural production at those doses. Shutting yourself down and risking perminate hpta damage. Make it worth wild of you are taking the risk man. I dont recomend anyone at 21 doing a cycle. Your brain is still developing at that age and AAS can have perminant effects. Buuuut, since you have already taken the plunge, well, like i said, do it right. Take at least a replacement dose of test (100-200mg) ew and primo shines at 600mg imo. And run at least 10 weeks. 12 is standard for long esters because they dont even really kick in untill week 4. Im surprised you even got results from previous runs with those doses. Maybe a good pump but i bet you would have made same results staying natural.