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Because peptides typically break down quickly in the digestive tract, most are administered through injections
For Vitamin B12, animal products are best, while iron can come from animals or plants, with vitamin C helping its absorption
Peptides are proteins
This usually goes away in a day or two
At age 20, plasma levels average approximately 200 ng/mL
Others may choose to take vitamin supplements in the form of daily multivitamin tablets
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