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Khan, Hadi 2007)

[PMC free article] [PubMed] [Google Scholar] 107.Choi A.M., Ryter S.W., Levine B

Keratin isnt a harmful substance, occurring naturally within the body, and is found in nails, hair and skin

Plant nutrients eventually enter the bloodstream through dietary digestion, but due to the presence of the bloodbrain barrier, substances in the blood are not fully absorbed and utilized by the brain
Reprod BioMed Online (2007) 14(6):72733

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