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B12 helps with energy production at the cellular level

The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians

/ B12 deficiency

Over time, a condition called pernicious anemia, leading to unhealthy red blood cells, might develop

As with many laboratory supplies, preferences may vary depending on: Research setup Availability Budget Personal experience Some researchers prefer one option over another based on familiarity or consistency within their own workflow

Some people have lost a significant amount of weight, while others mention issues such as nausea or tiredness in the first few weeks