The WADA Prohibited Substances and Methods list has been published for 2018, more details here.
Nothing major, but clarifications regarding salbutamol, the stimulant DMBA, and CBD oil, and changes with regard to glycerol, alcohol, and intravenous injections and infusions.
If you have medical needs, be sure to check your medications against the new lists and get any Therapeutic Use Exemptions that you may need.
In addition, during 2017 UK Anti-Doping have issued strong guidance for athletes on nutritional supplements – basically, stay away from them, or be very, very careful. More details on the page linked to above.