now foods glutathione supplement Skin Brightener with Ceramosides NOW Foods Glutathione Skin Brightener™

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Endotoxin levels should remain below 1 EU/mg for injectable use

Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency

Busse E, Zimmer G, Schopohl B, Kornhuber B

doi: 10.1016/s0079-6468(08)70246-7