Our expert says:
I'm not sure which condition you mean, but the true answer to both alternatives, would be : nothing. If by BPD you mean Bipolar Disorder, there is nothing useful available over-the-counter ( OTC). At most, St John's Wort works like a weak form of Prozac, but only for the depressive phases - NOTHING available OTC works for the manic phase or as a necessary mood-stabilizer.
If by BPD you mean Borderline Personality Disorder, no medication, OTC or otherwise effectively treats the basic conditoon, only skilled psychotherapy
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