These days they probably use dyes.
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Interesting
For instance, although therapeutic doses of most antipsychotics occupy 60% to 80% of the D2 receptors in patients, clozapine and quetiapine have been apparent exceptions, exhibiting clinical efficacy with only 10% to 45% occupation of D2 receptors (see references in ref. 7). It therefore has been suggested that the dopamine hypothesis of schizophrenia be extended into a serotonin-dopamine hypothesis.
What about supplementing with rate limiting amino acids like glycine and cysteine
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