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With developments in novel skin permeation enhancing methods such as microneedles and laser, copper compounds can potentially be used on skin for cosmeceutical or medicinal purposes 5,11,12
But oral Vitamin B12 supplements do have some limitations: Lower Absorption: For individuals with certain health conditions, such as gastrointestinal disorders or those who have undergone bariatric surgery, oral supplements may not be absorbed as effectively as injections
Both are considered doping substances by international sports authorities
Henseler, H
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