What works best for me is l-theanine, also inositol works great but in high doses hurt my stomach a little.
I found out that my adrenals werent functioning properly, in that case adaptogenic herbs are helpful for healing the adrenals (which can help with anxiety if you arent producing enough hormones to battle stress) For this I was taking ashwaganda (also called withania), rhodiola, ginseng, etc... There are several companies that make decent combos with all of these futurebiotics has stressassist that looks good (havent tried that but a good company) the idea behind these herbs is that it will help heal over a longer term like 1-2 months before u notice, but for immediate results use l-theanine and inositol, so u take them both together
kava works great for anxiety too, but if you have adrenal issues I would take something to heal them versus kava which sort of covers up the issue.