Just to kind of zoom out from that last study and show a possible continued link.
Also I think this histamine/probiotic supplement is giving me some nerve tinglings. Im not sure what to make of that yet, because I also know some people have related this sensation to Fin use or withdrawal. I have also seen this described with Zyrtec withdrawal.
Histidine decarboxylase deficiency in gene knockout mice elevates
male sex steroid production
“peripheral histamine is an
important regulatory factor of male gonadal development”
We found a highly significant reduction in the weight
of the testis in HDC-KO mice compared with wild type
animals. Since the concentration of testicular histamine is
higher in the immature gonad than in the adult one
(Zieher et al. 1971), it can be assumed that the lower
testicular weight observed in HDC-KO adult mice might
be the consequence of histamine-dependent events during
testicular development.
Further
studies are required to clarify the physiological role of
histamine in testicular ontogenesis. The novel aspect of the
regulation of androgenic hormones, i.e. the role of histamine in testicular ontogenesis and steroidogenesis, might
attract more attention to the unexpected side-effects of
antihistamines, which may shift the local balance and in
turn enhance androgen production