1. The perfect pair: how vitamins K2 and D3 combine to support health and well-being - https://nutraceuticalbusinessreview.com/the-perfect-pair-how-vitamins-k2-and-d3-combine-to-support-health-and-well-being--202233

  2. The Health Benefits of Vitamin D3 and Vitamin K2 for Women -https://www.complete-obgyn.com/blog/the-health-benefits-of-vitamin-d3-and-vitamin-k2-for-women

  3. The Combined Beneficial Effects of Postbiotic Butyrate on Active Vitamin D3-Orchestrated Innate Immunity to Salmonella Colitis- https://www.mdpi.com/2227-9059/9/10/1296

  4. Closing America’s Fiber Intake Gap -https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6124841/
  5. The Synergistic Interplay between Vitamins D and K for Bone and Cardiovascular Health: A Narrative Review - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5613455/