Interesting. Im not going to jump back into the supplements again yet, am going to give my current ones a try for a while longer. But here is a list of other natural agonists. Check them out, some are cheap:
Some known NMDA receptor agonists include:
Positive allosteric modulators include:
The weird thing about this is that it shouldn't work in that the current theories are that glutamate/nmda system is overactive in DPD. I mean, this could down regulate the nmda receptors or something.. who knows. Keep us updated, very happy for you
Just looked at sarcosine:
Sarcosine has been investigated in relation to schizophrenia. Early evidence suggests that intake of 2 g/day sarcosine as add-on therapy to certain antipsychotics (not clozapine) in schizophrenia gives significant additional reductions in both positive and negative symptomatology as well as the neurocognitive and general psychopathological symptoms that are common to the illness. Sarcosine had been tolerated well. It is also under investigation for the possible prevention of schizophrenic illness during the prodromal stage of the disease. It acts as a type 1 glycine transporter inhibitor and a glycine agonist. It increases glycine concentrations in the brain thus causing increased NMDA receptor activation and a reduction in symptoms. As such, it might be an interesting treatment option and a possible new direction in the treatment of the mental illness in the future. A 2011 meta-analysis found adjunctive sarcosine to have a medium effect size for negative and total symptoms.
Major depressive disorder is a complex disease and most currently available antidepressants aiming at monoamine neurotransmission exhibit limited efficacy and cognitive effects. N-methyl-D-aspartate (NMDA), one subtype of glutamate receptors, plays an important role in learning and memory. N-methyl-D-aspartic acid (NMDA) enhancing agents, such as sarcosine (N-methylglycine), have been used as adjunctive therapy of schizophrenia. Preliminary clinic trials indicated that intake of sarcosine improved not only psychotic but also depressive symptoms in patients with schizophrenia.
Sarcosine is significantly more effective in treating Major Depression (substantially improved scores on the Hamilton Depression Rating Scale, Clinical Global Impression, and Global Assessment of Function) than Citalopram over a 6-week period. Sarcosine was well tolerated without significant side effects.
A post here where people had mixed results from sarcosine/NAC/glycine but seemed to wear off: