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Collagen also exhibits an affinity for water, and it appears to hydrate the skin cells and Extracellular Matrix when it penetrates the skin barrier
It is not FDA-approved for human use
People who have gastrointestinal disorders like celiac disease or Crohn's disease or who have undergone weight-loss surgery may secrete too little hydrochloric acid or intrinsic factor
Some research has connected vitamin B12 deficiency with ED, but a consistent relationship hasn't been established
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