Gondwanaland
Senior Member
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In my case, I realized that I couldn't make enough serotonin without T3. When I started on LT4, I had to start a SSRI as well (which helped just a little). Then a couple of months later when I started taking T3, I was able to drop the SSRI.SSRIs prevent serotonin from being sucked back up into the neurons. They make serotonin available in the synapse for a longer period of time, so if one's serotonin is really low (and it will be low or become low if methylation is poor or cofactors for production are lacking), I think it's possible an SSRI wouldn't work very well. It's also possible serotonin receptors might be downregulated, but I'm definitely not an SSRI expert. (I've been through this in the past, an initial good response to antidepressants followed by loss of efficacy.)
Now, while I agree with the nutrient issue you described, I am now realizing that my liver is shutting down my endocrine system due to lowered capacity of hormone breakdown and lowered antioxidant power.