Peppermint Tea Update!!
This is a cool one. It involves menthol too, but it's even more important to peppermint tea as a whole. So check it out, first of all menthol was verified to have dopamine-promoting actions as a stimulant:
Evidence for the involvement of dopamine in ... [J Pharmacol Sci. 2003] - PubMed - NCBI
 Originally Posted by Evidence for the involvement of dopamine in ambulation promoted by menthol in mice.
Abstract
The present study examines the mechanism that underlies the ability of menthol (ME), a major constituent of peppermint oil, to promote mouse ambulation. We initially confirmed that bupropion (BUP), a dopamine (DA) uptake inhibitor, promotes ambulation in ICR mice. Since the subcutaneous administration of ME produced similar effects in mice, we investigated the effects of ME on ambulation when combined with BUP. The results showed that BUP potentiated the effect of ME on mouse ambulation. We then examined effects of the DA antagonists chlorpromazine, haloperidol, fluphenazine, spiperone, and SCH12679 on the ability of BUP and ME to promote ambulation. All of these DA antagonists attenuated the effects of BUP and ME. Prior exposure to reserpine, which depletes monoamines, caused decreased sensitivity to the ability of BUP and of ME in promoting ambulation. The tyrosine hydroxylase inhibitor alpha-methyl-p-tyrosine, similarly decreased subsequent sensitivity to the effects of BUP and ME. These results suggest that DA is involved in the abilities of ME and BUP to promote ambulation in mice.
But that's not even the best part. Menthone and pulegone, two other peppermint tea constituents of which the former was briefly discussed much earlier in this thread, were shown to share this dopaminergic activity!
Evidence for dopamine involvement in... [Pharmacol Biochem Behav. 2009] - PubMed - NCBI
 Originally Posted by Evidence for dopamine involvement in ambulation promoted by menthone in mice.
Abstract
The present study examines the mechanism that underlies the ability of menthone (MTN), a constituent of peppermint oil, to promote mouse ambulation. Since bupropion (BUP), a dopamine (DA) uptake inhibitor, promotes mouse ambulation, the effect of MTN combined with BUP on ambulation was investigated. The results showed that BUP with MTN produced an additive interaction on mouse ambulation. The effects of DA antagonists chlorpromazine, fluphenazine, haloperidol, SCH12679 and spiperone on the ability of MTN to promote ambulation were then examined. All of these antagonists attenuated the effects of MTN. Prior exposure to the tyrosine hydroxylase inhibitor alpha-methyl-p-tyrosine, which inhibits catecholamines synthesis, decreased subsequent sensitivity to the effect of MTN. These results suggest that DA is involved in the ability of MTN to promote ambulation in mice.
Evidence for dopamine involvement in... [Pharmacol Biochem Behav. 2010] - PubMed - NCBI
 Originally Posted by Evidence for dopamine involvement in ambulation promoted by pulegone in mice.
Abstract
I investigated whether dopamine (DA) is involved in the ambulation promoted by pulegone (PUL), a constituent of peppermint oil, in ICR mouse. Co-administration of PUL and bupropion (BUP) had an additive effect on their ambulation-promoting activities. When administered with PUL, the DA antagonists chlorpromazine, fluphenazine, haloperidol, SCH12679, and spiperone all attenuated the effect of PUL on ambulation. In addition, pretreatment with the DA depletor reserpine produced no subsequent sensitivity to the effect of PUL. Taken together, DA may be involved in the ability of PUL to promote ambulation in ICR mice but PUL may not be a direct DA agonist. The chemical structure of PUL is similar to menthol and menthone, and thus they may all be acting through a common mechanism.
If you still haven't realized the best part of this, then let me spell it out for you: as far as I know, there is no known constant between these three chemicals to cause this effect. This means that they may all be causing this dopamine increase through yet another unexplored mechanism!! It also means that using peppermint tea over straight menthol should increase the ratio of dopaminergic effects to menthol's other activity, which could be quite useful and which may have contributed to the known activity of peppermint tea as an aphrodisiac. I don't have much else to say about this yet, but I think it certainly adds to the credibility of using the tea for experimentation!
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