Treatment with high dose vitamin B12 been shown to be safe for more than 50 years Out of fear of overdosing vitamin B12, treatment is often reduced to below the frequency that is needed by the patient, or, even worse, treatment is stopped completely

(7)Fmoc-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (7) Preparation of Fmoc-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (6)Fmoc-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin(20DMF)5203DMF3DMF2Fmoc-Ala-OH0.7gDIEA0.4mlTBTU0.56gHOBT0.2gDMF 10ml1.53DMF3DMF2Fmoc-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin In the Fmoc-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin in step (6), add a decapping reagent (20% piperidine in DMF solution), react at room temperature for 5 minutes, and drain, Re-add the capping agent and react at room temperature for 20 minutes, wash with isopropanol for 3 times, DMF for 3 times, re-distilled DMF for 2 times, drain, add Fmoc-Ala-OH0.7g, DIEA0.4ml, TBTU0.56g , HOBT0.2g, DMF 10ml normal temperature reaction 1.5 hours, drained with a vacuum pump, washed 3 times with isopropanol, washed 3 times with DMF, washed 2 times with DMF evaporated, and dried to obtain Fmoc-Ala-Asp(otBu )-Asp(otBu)-Ala-Gly-Leu-Val-WangResin
Li et al., 2024
flavor enhancer: natural raspberry flavor
A., Siegel, S
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