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For example, people with very low B12 levels may feel slightly light-headed or tired for a few hours before they feel noticeably better, a sign that the body is actively responding
"The Effect of Tripeptide-Copper Complex on Human Hair Growth in Vitro." Arch Pharm Res
47 , S29
It is also whether the symptom is mild, persistent, worsening, or linked with another health risk
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