What is D3 Serum?
D3 Serum is a high-potency liquid vitamin D3 supplement from Premier Research Labs that provides 5,000 IU of vitamin D3 in a five-drop serving.
It is designed for people who prefer a measured liquid formula and want vitamin D3 without vitamin K2 or a capsule.
What Form of Vitamin D Is in D3 Serum?
D3 Serum contains vitamin D3 as cholecalciferol. This is the same general form of vitamin D the body can produce in the skin after appropriate ultraviolet B exposure.
The vitamin D3 in this formula is naturally sourced from lanolin. Because lanolin is animal-derived, D3 Serum is not a vegan product.
What Does One Serving Provide?
| Product Detail | Amount or Description |
|---|---|
| Serving size | 5 drops, approximately 0.11 mL |
| Vitamin D3 per serving | 125 mcg, equal to 5,000 IU |
| Approximate vitamin D3 per drop | 1,000 IU |
| Servings per container | Approximately 114 |
The drop format provides more flexibility than a fixed-dose capsule. A qualified practitioner can recommend a smaller number of drops when the full 5,000 IU serving is not appropriate.
Why Is It Made With Olive Oil?
Vitamin D is fat-soluble. D3 Serum places the vitamin D3 in an extra virgin olive oil base, which provides a suitable carrier for the nutrient.
The formula also contains D-alpha tocopherol, which is included as a preservative. It contains no artificial colors or flavors and no added magnesium stearate.
What Is D3 Serum Designed to Support?
Vitamin D3 helps support calcium and phosphorus absorption, normal bone mineralization, muscle function, neuromuscular activity, and healthy immune function.
D3 Serum should not be viewed as an automatic daily requirement for everyone. A five-drop serving is a substantial amount of vitamin D, so total intake from multivitamins, combination products, fortified foods, and other supplements should be considered.
Practical Takeaway
D3 Serum is a concentrated D3-only liquid formula with approximately 1,000 IU per drop. Its main advantages are its simple formula, olive oil base, and adjustable drop format, but the amount used should fit the individual rather than being chosen simply because vitamin D is widely recommended.