glutathione detection kit Sigma-Aldrich Assay Kit, sufficient for 700 assays 1 Red Absorbance is read at ~400 nm for GSH and ~356 nm for total mercaptens. Glutathione (GSH) Colorimetric Detection Kit

This is why the safest way to read any published range is as background, not instruction

As an aside, we are unsure if the fatigue is purely down to B12 deficiency or if its long covid" If your B12 deficiency is not due to diet, I'd expect GP to at least test you for PA and Coeliac disease, two autoimmune conditions that can lead to B12 deficiency

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doi: 10.3389/fneur.2022.1018785

[225] [226] Drummer Zach Hill recorded Pattinson's playing on his phone during a jam session and later sampled it into the final song

& Jarome, T