Different amounts of propylene glycol change the thickness of katuk leaf hair tonic.
The best mix of propylene glycol and sorbitol was found for a cream to prevent hair loss using saw palmetto extract.
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June 2021 in “Journal of Pharmaceutical Care Anwar Medika” The hair tonic made from cayenne pepper leaf extract is physically stable and suitable for use.
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January 1954 in “Physiological Reviews” Hair growth is cyclic and influenced mainly by local factors.