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Progressing too fast Related to starting too high, progressing too quickly through concentration levels doesn't allow skin adequate time to adapt
Data (2017)- Russo, G
Some people may also suffer from pernicious anemia, which inhibits the body from being able to absorb enough vitamin B12, causing a deficiency
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Jan 15, 2026 Ninety percent of researchers using GHK-CU get their dosing wrong
Still, animal products may also contain other substances that can interfere with vitamin B12 absorption, so vegetarians and vegans may be at risk of deficiency
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