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Soft keratin present in the horny layer of the epidermis, containing between 2 and 4% L-cystine and hard keratin , present in the nails and hair, containing between 14 and 18% L-cystine
BMJ 328 , 1405 (2004)
But like any medical treatment, they work best when undertaken thoughtfully with the guidance of an experienced physician
Initially, many insurance companies in Colombia reimburse OWS only for patients with cardiovascular disease, potentially explaining the high proportion of patients with a prior myocardial infarction or stroke in our cohort
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