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In liquid dietary supplements, B12 is in free form, and is easily exposed and degraded by vitamin C. They cite Yamada 2004, which I havent been able to track down

Light stomach discomfort or nausea

The fat-soluble vitamins are not absorbed directly into the bloodstream, but rather are absorbed into lacteals in the small intestine via chylomicrons and then transported through the lymphatic system before finally being released into the bloodstream.(8) However, unlike the water-soluble vitamins, an excess of any fat-soluble vitamin doesnt leave the body through fluids (urine, sweat, etc.), but rather is stored in the liver or adipose tissue for later use.(12) Excessive intake of these vitamins can cause toxicity because they are stored anywhere from a few days to several months and levels will accumulate over time

That is the only thing you need to remember

In many regions it remains a research peptide and should only be used under medical supervision