So your thinking of doing a cycle that includes Nandrolone decanoate but your scared of the dreadful "deca dick" & and shut-down of your sperm production. don't fear a new study about the benefits of taurine is here.
theory of study
Taurine is found in the cells of all tissues that burn high amounts of energy. One theory is that taurine, together with glutathione, helps protect the cells against harmful compounds that are released when energy is generated.
The testes is one type of tissue where you find high levels of taurine. If you boost the taurine concentration in the testes by giving supplements, then testosterone production rises.
conclusion:
supplementing with taurine can be beneficial to help
REDUCE (but not completely) the decrease in sperm production as a result from Nandrolone decanoate. also increasing your natural test production.
reference
1. Toxicol Appl Pharmacol. 2015 Feb 1;282(3):285-96.
2. Adv Exp Med Biol. 2013;776:347-55.
3.
www.ncbi.nlm.nih.gov/pubmed/19921479
4.
www.ncbi.nlm.nih.gov/pubmed/12107759