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Ask your doctor for all three if your serum B12 is borderline, or if you have symptoms despite a level in the normal range
These factors can change the needed dosage
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GHK-Cu has a substantially larger research base
Your doctor may prescribe it if you have a documented B-vitamin deficiency or a condition like malabsorption, severe gastrointestinal issues, or after certain surgeries where your bodys demand for B vitamins is higher
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