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Mass spectrometry (MS) has long been used for the identification and determination of the molecular structure of organic compounds ( Although a growing body of literature on PCT and user characteristics associated with PCT use exists ( 2 Materials and methods 2.1 Scope Samples declared as containing substances intended to enhance sports performance, such as AAS, other PEDs, or substances used after the AAS cycle to mitigate side effects, were included

The consequences of impaired methylation pathways are devastating and result in reduced activity of proteins, reduced production of brain neurotransmitters (seretonin, dopamine, GABA etc), increased inflammation, decreased production of glutathione, alterations in DNA and in cell membrane signaling

If vitamin B 12 intake ceases, deficiency would usually not develop for at least 1-2 years, sometimes even longer

and Bond, P., 2025

Once produced or ingested, vitamin D undergoes hydroxylation in the liver to form 25-hydroxyvitamin D [25(OH)D], the main circulating form used to assess vitamin D status, and then in the kidneys to produce the active hormone 1,25-dihydroxyvitamin D