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Description
If a freezer isn't available, refrigeration at 2-8C (35.6-46.4F) is acceptable for shorter durations (weeks to a few months)

Gastroenterology 146 , 210221.e13 (2014)

It is important to note that whilst B12 deficiency can cause nerve pain, not all nerve pain is caused by B12 deficiency
Another practical catch: EGF is a fragile protein so it reacts badly to heat and the wrong pH
