Cobalt - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6545699/ - https://www.sciencedirect.com/science/article/abs/pii/S0162013422003774 - https://foodminerals.org/cobalt/ Vanadium - https://www.sciencedirect.com/science/article/abs/pii/S0946672X23000779 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7120733/ - https://www.webmd.com/vitamins/ai/ingredientmono-749/vanadium Iron² - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4452827/ - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4452827/ - https://www.healthline.com/health/iron-nutrient