Least I find it so.
Current Trial; 1.5mg methylcobalamin 3mg/ml, 1.5mg adenosylcobalamin 3mg/ml, 1.5mg hydroxocobalamin 3mg/ml. SC injection 4-5 times a day including setting an alarm to inject at night if warrented. 50 mg B6 in the form of P-5-P three times a day or pain from peripheral neuropathy returns. Benfotiamin B1 300 mg three times a day. 2 mg Magnesium L-Threonate twice a day to prevent muscle cramps.
With the current trial my 'stuffy head' returned likely from my body healing. I chose to take Betaine 1.5 g twice a day because that has been successful in the past. There was an immediate effect unlike when I took it before at this amount. It felt positive but caused me to cough up mucus. It is working itself out.
The cause of this improvement and change is unknowable. It could be that my body has improved due to improved suplimentation over time. It could be the more effective suplimentation. Could be more sun energy.
Also I have a neighbor that I chat with and that includes my supplementation quest. They have observed my dramatic improvement and asked their doctor about it. The doctor said to take a B complex and the improvement was dramatic. I noticed a downturn they were experiencing and asked if he stopped taking the B complex and he had. He will never self treat and will die following his doctors advice. His choice.