https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8983170/Astaxanthin Enhances Gingival Wound Healing following High Glucose-Induced Oxidative Stress - PMC (nih.gov)  https://pubmed.ncbi.nlm.nih.gov/29044575/Investigation of the effect of astaxanthin on alveolar bone loss in experimental periodontitis - PubMed (nih.gov)  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7019381/Carotenoids and Periodontal Infection - PMC (nih.gov)  https://www.jstage.jst.go.jp/article/jcbn/56/3/56_14-109/_articleAnti-inflammatory effects of astaxanthin in the human gingival keratinocyte line NDUSD-1 (jst.go.jp)