meta-Tyramine (or m-Tyramine) is an endogenous trace amine neuromodulator, can be metabolized into dopamine via peripheral or brain CYP2D6 enzymes in humans. Meta-tyramine appears to inhibit the synthesis of dopamine.

Djenkolic acid (or sometimes jengkolic acid) is a sulfur-containing toxin and non-protein amino acid naturally found in Djenkol beans of the South-East Asian legumes jengkol (Archidendron jiringa). Djenkolic acid is toxic to humans, often causing kidney failure. The toxicity of djenkolic acid in humans arises from its poor solubility under acidic conditions after consumption of the Djenkol bean. The amino acid precipitates into crystals which cause mechanical irritation of the renal tubules and urinary tract, resulting in symptoms such as abdominal discomfort, loin pains, severe colic, nausea, vomiting, dysuria, gross hematuria, and oliguria, occurring 2 to 6 hours after the beans were ingested. Treatment for this toxicity requires hydration to increase urine flow and alkalinization of urine by sodium bicarbonate. Furthermore, this poisoning can be prevented when consuming Djenkol beans by boiling them beforehand, since djenkolic acid is removed from the beans.