5-HTP doesn't have dopaminergic effects; on the contrary they are anti-dopamine.
Though some receptors of serotonin may promote dopamine activity, the vast majority don't - and emotional blunting is not uncommon but ubiquitous with artifical (or excessively natural) serotonin boosting.
I know that emotional blunting is common. That's what I stated, and that's what occurs with any experimentation of serotonin promoting agents in excess quantities. This is common knowledge.
Let me ask you a question. If a substance protects against amphetamine induced neurotoxicity, protects dopmainergic neurons, promotes dopamine release, and enhances sexual function and drive in small doses, would it be categorically safe to say that it enhances dopaminergic function?
I would say that this specific action profile better adheres to a responsible semantic categorization of "dopamine enhancing" then do most molecules that are commonly accepted as dopamine enhancing. This is because 5-HTP seems to enhance dopamine through a protective and upregulating role rather than as a direct agonist leading to eventual down-regulation. In other words, at a specific correct dose and frequency, 5-HTP seems to upregulate dopamine function. However, experientially, that correct dose and frequency window is sensitive in terms of realizing an upregulation effect that surpasses mere preservation of function in the face of neurotoxicity. Even 50 mg too much can suppress dopamine for days, in my experience. Once you know what dopamine suppression and dopmine enhancement feel like, it's quite easy to identify what is going on. That being said, a relative overdose likely still has robust protective effect on dopaminergic neurons in the presence of strong dopamine agonists such as anything in the amphetamine class.
5-HTP protects dopmainergic neurons, an action which has a dopaimine enhancing effect that, I suspect, would level out with chronic use. 5-HTP also has an initial HGH agonism effect that quickly ceases with chronic use. Therefore, it would likely be best to supplement with it intermittently every few days, and at a reasonable dose, to realize the dopamine enhancing effect. In fact, this is the exact effect that I get with intermittent use at relatively low doses. 100 mg suppresses dopamine for me, leading to depression and reduced sexual drive. 50 mg every few days mildly enhances mood, blunts anxiety (possibly the mechanism of mood enhancement - the anxiety suppression does increase with dose likely due to an increasing ability to block neurepinephrine production), mildly increases motivation, and markedly enhances sexual drive. Too much of it crushes motivation, energy, and sex drive. It also potently protects against excitotoxicity and the resultant inflammation, an issue that I currently have two decades of experience with. If a person does not have such an issue, then their experience with 5-HTP will likely be different. However, the OPs issue is that he is looking to protect against a stimulant rather than to solve for an energy deficit in the brain.
This paper confirms what I experience, and the 6 hour delayed rise in dopamine hints at an adaptive upregulation in my opinion. In my experience, 6 hours is subjectively how long it takes:
http://neurosciencem..._depletes-3.pdf
Single dose 5-HTP mediated GH release:
http://press.endocri...0/jcem-36-1-204
5-HTP supplementation delays ALS:
http://www.ncbi.nlm....pubmed/14527871
5-HTP supplementation reduces amphetamine self-administration in rats:
http://www.sciencedi...091305786903977
5-HTP reduces the undesireable locomotor effects of amphetamine:
http://www.ncbi.nlm....les/PMC3044786/
5-HTP enhances dopamine release in rats administered MDMA:
http://onlinelibrary...0243.x/abstract
A study that I have very recently read, but that I can now not seem to find, concluded that 5-HTP preserves motor neuron function. Though, you can infer that from some of the above studies.
OP, here is a study for you:
MDMA induces programmed death of human serotogenic cells and leads to long-term neuropsychiatric behaviors such as panic and psychosis:
http://www.fasebj.or.../2/141.full.pdf
And it fucks your memory:
http://link.springer...3-1463-5#page-1
Not to sound too dick-ish, but you may be back on this board in a few years trying to work out how to handle your newfound anxiety and likely depression, as well as how to regain your lost healthy stress response. FYI, there isn't much help on here for those conditions nor memory loss. Good luck!
Edited by golgi1, 04 September 2014 - 06:07 PM.