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This is because GHK-Cu itself works in picogram quantities

These factors include how often the injections are administered and the metabolism rate of the person

Some individuals are more likely to benefit from B12 injections, especially if they: Follow a vegan or vegetarian diet Experience digestive or absorption disorders (e.g., Crohns, IBS, low stomach acid) Are aging adults , as natural absorption declines with age Take medications that interfere with B12 levels, such as metformin or acid reducers How Often Are Injections Needed