US National Library of Medicine National Institutes of Health

Oxidative stress, aging, and diseases: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5927356/
 
Therapeutic Applications of Rose Hips from Different Rosa Species: https://www.ncbi.nlm.nih.gov/pubmed/28587101
 
Bioactive compounds and antioxidant activity of Rosa canina L. biotypes from spontaneous flora of Transylvania: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3668991/
 
Role of Vitamin A in the Immune System: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6162863/
 
Effect of Flavonoids on Upper Respiratory Tract Infections and Immune Function: A Systematic Review and Meta-Analysis: https://www.ncbi.nlm.nih.gov/pubmed/27184276
 
The Role of Vitamin E in Immunity: https://www.ncbi.nlm.nih.gov/pubmed/30388871
 
Vitamin C supplementation lowers serum low-density lipoprotein cholesterol and triglycerides: a meta-analysis of 13 randomized controlled trials: https://www.ncbi.nlm.nih.gov/pubmed/19674720
 
Vitamin C and Heart Health: A Review Based on Findings from Epidemiologic Studies: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5000725/
 
The Effects of Flavonoids on Cardiovascular Health: A Review of Human Intervention Trials and Implications for Cerebrovascular Function: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6315948/
 
Oxidative Stress and Inflammation: What Polyphenols Can Do for Us?: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5055983/
 
Rosehip - an evidence based herbal medicine for inflammation and arthritis: https://www.ncbi.nlm.nih.gov/pubmed/22762068/
 
The Roles of Vitamin C in Skin Health: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5579659/
 
The effectiveness of a standardized rose hip powder, containing seeds and shells of Rosa canina, on cell longevity, skin wrinkles, moisture, and elasticity: https://www.ncbi.nlm.nih.gov/pubmed/26604725/
 
Discovering the link between nutrition and skin aging: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3583891/