The abuse of Decanol usage can bring experiences of water retention and gynecomastia etc. The best way to avoid Decanol side effects is using anti-estrogens and simply maintaining the recommended dosage level.
The generally recommended dosage for normal users is about 400-600mg per week. For beginners, effective doses are often only 200-300mg per week. It’s meaningless to take doses above 600mg per week because the risk of side effects will rise instead of adequate positive effects.