We had a poster here, and I have seen on the net a couple of times comments from a lab technician in the US that most testing places (at least here) cannot go up past 2000.
What may have happened to you is that when you started, with that 20mg daily, you flooded the serum, which then went to storage both in the liver and spinal fluid, and when that was normalized, your readings dropped. If you had depleted your liver and CNS you would have had symptoms and been in a bad way. It takes time to recover the levels in those two places.
Many informational sites say that our livers' if in good shape, can store enough B12 to last 5 yrs. This is because we evolved in an ice age where food was hard to get sometimes. Being hunter gatherers we had lean times and rich times.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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