Collagen ɗaya daga manyan abubuwan da ake nema a fannin kwalliya da tsawon rai, amma mafi yawan samfuran suna da takardun placebo ne kawai. A wani gwaji da mata 114 masu shekaru 45‑65 suka halarta, gram 2.5 na takamaiman peptide mai aiki Verisol ya rage ƙyallin tabon idanu da kashi 20 % idan aka kwatanta da placebo bayan makonni 8. Biopsies sun nuna ƙaruwa a procollagen I da kashi 65 % da elastin da kashi 18 %, yayin da ƙaruwa a fibrillin (6 %) ba ta da muhimmanci.
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