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Injections are good at treating more severe deficiencies, says Foxx
Separate high-dose oral b12 (1000 to 2000 mcg daily) or regular b12 injections (1000 mcg weekly or monthly) offer more reliable repletion
The oral route is particularly relevant for gastrointestinal applications because it delivers the peptide directly to the tissues where it is needed
Watch for cloudiness, visible particles or precipitate, a color shift (most peptides are colorless GHK-Cu is the exception and reads blue, which is normal), or foam that will not settle
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