Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Vitamins, Medications, Tablets, & Supplements Used To Shrink Fibroids Frontiers Evidence Based Management of Uterine Fibroids With Botanical Drugs A Review FOUR clinical trials published between 2019 2021 found that vitamin D supplementation either reduced the size of fibroids or inhibited their growth., Preclinical models have given us insight into how.