Long-term supplementation with 3200 to 4000 IU of vitamin D daily and adverse events: a systematic review and meta-analysis of randomized controlled trials | European Journal of Nutrition
Amazon.com: Atrilly DLux4000 Vitamin D Oral Spray | Vitamin D3 Supplement | Natural Peppermint Flavour' : Health & Household
Vitamin D3 5,000 I.U | Vitamin D3 Supplement | Country Life
The 9 Best Vitamin D Supplements
Carlson - Super Daily D3 4,000 IU (100 mcg) per Drop, Vitamin D Drops, Vegetarian, Unflavored, 90 Drops - Walmart.com
BetterYou DLux 1000/3000/4000 IU Vitamin D Daily Oral Spray - 15ml | eBay
Vitamin D3 (4000 IU)
The Authentic Reality: Vitamin D - Mr Safology
Taking too much vitamin D can cloud its benefits and create health risks - Harvard Health
Vitamin D3 4,000 IU - 100 mcg 360 Softgels – NatureWise
Safety and tolerability of high-dose daily vitamin D3 supplementation in the vitamin D and type 2 diabetes (D2d) study—a randomized trial in persons with prediabetes | European Journal of Clinical Nutrition