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Check pH:Test your serum's pH with strips or a meter. Aim for 4.55.5. If it's too alkaline, add a tiny amount of citric acid dissolved in a few drops of water. If too acidic, add a minimal amount of sodium hydroxide solution. Retest after each adjustment
1-4 times per day
doi:10.1186/1471-2407-9-56 65
Store in cool and dry place do not above 25, protect form light
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