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2011;110(5):159166 (exact pages may vary by source)
The practical answer is simple: if you want the cleanest research comparison, GHK-Cu is easier to evaluate
Oral B12 looks cheap, but if your body absorbs very little of each pill because of low stomach acid or a gut condition, much of that spending does not translate into results, and you keep buying bottle after bottle
Uncover the significance of B12 Shots & B12 Injections: The Good, Bad, and Alternative
At 2mg five times weekly, 100mg lasts about 10 weeks, covering most protocols
MDPI Takiwaki, H., et al
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