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Hormonal changes, genetic factors, oily skin, stress and some cosmetic products can cause acne
Furthermore, representative electrochemical and physical parameters of typical hydrogel electrolytes are compared in Table 2 to provide a quantitative insight into the performance differences among natural, synthetic, and composite polymer matrices
doi: 10.1038/376070a0 74 De PalmaMVenneriMAGalliRSergi SergiLPolitiLSSampaolesiMet al
That said, some experts believe diet, exercise, and herbal supplements are worth a try
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