Without side effects, please do not stop taking your antipsychotic, studies are all in adjunction with antipsychotic, the supplement below are at dosage or contain elements not commonly found in our diet
For positive symptoms
L theanine 400 mg and below
For negative symptom
Sarcosine 2 grams and below, adjust to 1 gram or lower if irritability occur
With mild side effects
Ginkgo biloba 240 mg or lower
ashwagandha 500mg or lower, some studies say there are traces of liver damage at low dosage
Others: feel free to contribute