Natural Factors Vitamin D3 | 1000 Iu | 180 Soft Gels. Promotes strong bones & teeth o Features organic flaxseed oil o 1,000 IU per softgel o Natural Factors Vitamin D3 | 1000 Iu | 180 Soft Gels o Sold by Swanson Vitamins... - Natural Factors Vitamin D3 | 1000 Iu | 180 Soft Gels.