Fellow POISers,
Some of you may have suffered from MTHFR a1298c mutation (see Kurtosis' post before:
http://poiscenter.com/forums/index.php?topic=881.5)
I am A1298C homozygous (+/+), which is believed to lead to low BH4 levels.
Just want to update that there is now generic BH4 available in north america, which cost about $60 for 20 doses of 2.5mg per day
I experimented it in the past week, and it has significantly increased my energy / mental clarify. And much fast recovery time from POIS. (6-hr sleep suffice now)
You can google the sources your self using "tetrahydrobiopterin bh4 source" on sites like reddit.
Benefit of taking BH4 vs taking NADH
required dosage is much lower when directly dosing with BH4 (2.37mg BH4 = 6.67mg NADH or more)
no need for fasting
Relevance of BH4
* Cofactor for all three isotypes of nitric oxide synthases (nNOS, eNOS, iNOS)
* The resultant NO is important to reduce mast cell activation: see
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1906415/* BH4 is the rate limiting factor in the production of neurotransmitters: Serotonin and Melatonin (1 BH4 molecule consumed when tryptophan --> 5HTP); and
Dopamine, Noradrenalin, Adrenalin (1 BH4 molecule needed if starting tyrosine, 2 BH4 molecules needed from Phe)
From my experience, Kuvan (prescription BH4, super expensive) dosage is too high and unnecessary for A1298C allele carrier.
(modified for typos)