What are the ingredients in Optimal Vitamin D Drops sourced from? Education Team November 03, 2021 18:49 Updated Follow Ingredient Source Vitamin D3 Lanolin Related articles How do I use Vitamin D3 + K2 Drops? Magnesium Products Comparison Chart Are Optimal Vitamin D Drops free from GMOs? What is the purpose of each ingredient in SulfiteX Drops? Why is this product not suitable for vegans? Comments 0 comments Article is closed for comments.