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The peptide itself is not a controlled substance in Canada, so customs issues are relatively rare for personal research quantities, but awareness of potential delays helps with planning

Additionally, older adults who naturally have a more challenging time absorbing vitamin B12 or those on certain medications that affect B12 absorption may be ideal candidates

"Biologically active peptides: from a laboratory bench curiosity to a functional skin care product." International Journal of Cosmetic Science

Both are dominated by gastrointestinal adverse events nausea, vomiting, diarrhea, constipation, and abdominal pain that are mostly mild to moderate and concentrate during dose escalation

This path will be discussed in more detail later in this article

For children , Ill often add extra vitamin C and/or zinc to their multivitamins to support the antioxidant network if they are taking Tylenol for more than a day or two