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have an allergy to cobalt
Thats because peptides degrade easily in the digestive tract and tend to be too large molecularly to permeate the skin or intestinal lining,5 often yielding a bioavailability as low as 1-2%.6 But there are some peptides that have a small enough molecular size that they easily transfer into the bloodstream as either an oral or a topical supplement
However, people on certain medications or those with specific diseases may not be able to absorb vitamin B12 effectively
Freezing reconstituted peptides may extend stability though repeated freeze-thaw cycles should be avoided
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