Ingredient
Vitamin D3
What is Vitamin D3?
Vitamin D3, also known as cholecalciferol, is a form of vitamin D that is synthesized by the skin when exposed to sunlight. It is also derived from lanolin (sheep's wool) or fish oil for supplement production.
It is used in foods and supplements to support bone health by aiding calcium absorption. Scientific studies suggest it may also play roles in immune function and mood regulation, though some evidence is still inconclusive regarding its effects beyond bone health.
When you see Vitamin D3 on a label, it typically indicates an effort to ensure adequate dietary vitamin D, especially in populations at risk of deficiency due to limited sun exposure.
Commonly found in: Dietary supplements, Fortified cereals, Fortified dairy products, Fortified plant milk, Fortified margarine
What to watch
- Excessive intake can lead to toxicity, characterized by elevated blood calcium levels.
Benefits
- Supports bone health by enhancing calcium absorption.
- May contribute to immune system function.
- Linked to improved mood and reduced depression in some studies.
Vitamin D3 is considered Generally Recognized As Safe (GRAS) by the FDA for use in foods.
While research supports its role in bone health, evidence is mixed regarding its effectiveness for other health benefits.
Vitamin D3 is typically animal-derived; vegans may prefer the plant-based form, Vitamin D2, or D3 sourced from lichen.
Sources: Vitamin D Fact Sheet
Scout's take
Beneficial ingredient — whole-food or functional value in this product class.
The case against
Excessive intake can lead to toxicity, but this is rare with standard dosages.
from the analysis of Nordic Naturals Ultimate Omega Fish Gelatin Softgels LemonThe case for
Promotes calcium absorption and bone health, and supports immune system function.
from the analysis of Nordic Naturals Ultimate Omega Fish Gelatin Softgels Lemon · echoed in 4 other analysesEssential for calcium absorption and bone health, supporting immune function.
from the analysis of Fairlife CHOCOLATE 2% REDUCED FAT ULTRA-FILTERED MILKMore from Scout's analyses
Vitamin D3 is essential for calcium absorption and bone health. It is often added to dairy products to enhance nutritional value. Adequate intake supports immune function and bone strength.
from the analysis of Oikos BLENDED GREEK YOGURTVitamin D3 is added to milk to enhance its nutritional value, supporting bone health and immune function. It is a fat-soluble vitamin that helps in the absorption of calcium and phosphorus. Fortification with vitamin D3 is common in dairy products to prevent deficiencies.
from the analysis of Organic Meadow Grass Fed 3.8% Organic Whole Milk plastic bottleVitamin D3 is an essential nutrient that supports bone health, immune function, and mood regulation. It is often derived from lanolin or fish oil and is more effective than vitamin D2. This ingredient is included to enhance the nutritional profile of the supplement.
from the analysis of Nordic Naturals Ultimate Omega Fish Gelatin Softgels LemonFound in 29 products
+ 5 more products in the Scout app
Scan any product to see every ingredient explained — and healthier swaps.
Download on theApp Store GET IT ONGoogle Play