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Do peptides have side effects
For context on how structural properties of specific research compounds affect their handling requirements, see GHK-Cu research overview
B12 injections are recommended for those who are deficient in vitamin B12
These might be a better option for people with increased nutrient needs or those at a greater risk of deficiency, including individuals with medical conditions that affect absorption
However, MMA levels can be elevated in those with thyroid and kidney conditions, which limits the tests specificity (9, 10)
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