l carnitine and citrulline malate L-Citrulline Malate, 750 mg, 60 Capsules Citrulline Malate Powder - Citrulline

In post-surgical or critically ill patients, glutamine may improve nitrogen balance, preserve intestinal integrity, maintain intracellular glutamine levels, and reduce hospital stay (3) (4) (12) (13) (40) , but data on whether it can prevent infections (5) (40) or improve clinical outcomes (57) are mixed and it did not reduce the time to discharge alive from hospital in patients with severe burns (52)

Am J Clin Nutr 92:525531

Alternatively, you can find them in injectable form

Why do they work well when taken together

A derivative of LA, sodium zinc histidine dithiooctanamide (DHL-HisZn), ameliorates OVA-induced nasal hypersensitivity, suppresses mast cell degranulation, and reduces IgE levels by suppressing Th2 and Th17 responsesin AR mice [156]

There are no other test results that refer to b12