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glutathione and l theanine l-theanine: From tea leaf to trending supplement – does the science match the hype for brain health relaxation? L-Theanine
Description
10.1097/HJH.0000000000003298 121 SalekR

Patients with pernicious anaemia, malabsorption disorders (such as Crohn's disease or coeliac disease), or following gastric surgery require regular B12 supplementation to prevent serious complications including megaloblastic anaemia and neurological damage

For recreational CrossFit athletes, this is not a concern.

This pathway requires the activity of methyladenosine phosphorylase (MTAP) as well as Met synthase (MS)
