You definitely need to work with your doctor on adding supplements to your medication regimen. Ideally, you’d work with an integrative medicine doctor, as they are more versed in natural treatments. There can be interactions with medication, or interactions among supplements, so you must work with someone knowledgable on this.
Here’s more information about supplements commonly used by those with ADHD:
It very well could also be that you just aren’t on the right stimulant for you. There are many others to choose from.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism