D3 Serum contains vitamin D3 as cholecalciferol, extra virgin olive oil, and D-alpha tocopherol.

The short ingredient list provides a concentrated liquid D3 formula without artificial colors, artificial flavors, or added magnesium stearate.

D3 Serum Ingredient Breakdown

Ingredient	Role in the Formula
Vitamin D3 as cholecalciferol	Provides 125 mcg, equal to 5,000 IU, per five-drop serving
Extra virgin olive oil	Acts as the liquid carrier for the fat-soluble vitamin D3
D-alpha tocopherol	Included as a preservative

Vitamin D3 as Cholecalciferol

Cholecalciferol is the D3 form of vitamin D. After absorption, it is converted by the liver into 25-hydroxyvitamin D and then primarily by the kidneys into calcitriol, the active vitamin D hormone.

The vitamin D3 used in D3 Serum is naturally sourced from lanolin. Lanolin comes from sheep’s wool, which makes the product unsuitable for vegans.

Why Extra Virgin Olive Oil Is Included

Vitamin D is fat-soluble, so an oil base provides a logical delivery medium. The olive oil keeps the vitamin D3 dispersed in liquid form and supports the product’s drop-by-drop format.

People with an olive allergy or sensitivity should review the ingredient list before use.

What Is D-Alpha Tocopherol?

D-alpha tocopherol is a form of vitamin E. In D3 Serum, it is identified as a preservative rather than the product’s primary active ingredient.

The source of the D-alpha tocopherol is not specified in the confirmed product information. For that reason, soy-free status should not be assumed unless the current label or manufacturer directly confirms it.

What Does D3 Serum Leave Out?

Confirmed product characteristics include:

• No artificial colors
• No artificial flavors
• No added magnesium stearate
• Kosher designation

D3 Serum does not contain vitamin K2. Anyone looking for a combined D3/K2 product would need a different formula.

Is D3 Serum Vegan or Vegetarian?

D3 Serum is not vegan because its vitamin D3 is derived from lanolin. Vegetarian suitability is not clearly confirmed in the available product information, so the product should not be described as vegetarian without checking the current label or obtaining direct confirmation.

Practical Takeaway

D3 Serum has a simple three-ingredient formula: lanolin-derived vitamin D3, extra virgin olive oil, and D-alpha tocopherol. Its simplicity may appeal to people seeking a liquid D3-only product, but vegan users and people with relevant ingredient sensitivities should choose carefully.