Experts suggest maintaining blood levels between 50 ng/mL and 80 ng/mL for vitamin D and an omega-3 index of 8% to 12%.
4,000 IU of Vitamin D is OK - 19 organizations agree - 2018 has the folllowing
Institute of Medicine
Endocrine Society, Vitamin D Council
American Academy of Pediatrics (AAP)
American Academy of Dev. Medicine and Dentistry
Scientific Advisory Committee on Nutrition (UK)
European Food Safety Authority
Central Europe consensus
Italian Endocrinologists, Italian Consensus
Nutrition - French Society of Paediatrics
European Society for Paediatric Gastroenterology ....
European Society for Clinical and Economic Aspects of Osteo...
The Nordic Council of Ministers
Health Council of the Netherlands
Getting Vitamin D into your body has the following chart
Vitamin D and Omega-3 category starts with
Omega-3 and Vitamin D separately & together help with Autism, Depression, Cardiovascular, Cognition, Pregnancy, Infant, Obesity, Mortality, Breast Cancer, Smoking, Sleep, Stroke, Surgery, Longevity, Trauma, Inflammation, MS, etc
See also - Overview: Omega-3 many benefits include helping vitamin D
Omega-3 index of 8 to 11 is optimal (German) - Oct 2019
Some Omega-3 index references
Omega-3 index of 5 greatly decreases the risk of an early preterm birth – Dec 2018
Higher Omega-3 index (4 to 8 percent) associated with 30 percent less risk of coronary disease (10 studies) July 2017