Yes, you can give yourself B12 shots if youre trained and have a doctors watch
Detecting them reliably requires targeted mass spectrometry methods developed compound by compound, and in the case of growth hormone, indirect biomarker panels rather than direct measurement at all
Hsieh MJ, Liu HT, Wang CN, et al
However, you can purchase GABA supplements at your local health foods store
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By selectively inhibiting NNMT an enzyme central to energy regulation and fat metabolism this compound has demonstrated, in preclinical studies, the capacity to elevate intracellular NAD and SAM levels, suppress lipid accumulation in adipocytes, and reduce white adipose tissue mass in diet-induced obese mouse models