I am a somewhat regular user and usually will use for 2 months and then cycle off for a month or the results I see seem to diminish
You may be suffering from vitamin B12 deficiency
B is needed for the production of neurotransmitters such as GABA, serotonin, and dopamine, and for glycogen breakdown and hemoglobin synthesis
Rising hunger, waist growth, weight gain above about 2 lb per month, persistent heart-rate elevation, or declining strength indicate that the lower dose is not maintaining the prior response
Resources: B12 vitamin is easy to procure
With the growing availability of mature systems and strategies in biotechnology and the continuously expanding knowledge of cellular processes and involved biomolecules, human sports drug testing has become a considerably complex field in the arena of analytical chemistry