Understanding Vitamin D3 vs. D2

Vitamin D exists in two primary forms: D2 (ergocalciferol) from plant sources and D3 (cholecalciferol) derived from animal sources such as lanolin from sheep's wool. Studies indicate that D3 is more effective at raising and maintaining blood levels of vitamin D compared to D2. That is why Source Naturals uses D3—it is the form your body naturally prefers. Each capsule delivers 50 mcg (2000 IU) of vitamin D3, a potent yet safe dose for daily maintenance.

Why Vitamin D3 Is Essential for Your Health

Often referred to as the 'sunshine nutrient,' vitamin D is produced by your body when skin is exposed to sunlight. However, many individuals do not get sufficient sun exposure—especially during winter months or if you live in northern latitudes. Supplementation can help fill this gap. Source Naturals Vitamin D-3 provides 2000 IU of cholecalciferol, the identical form your body produces naturally. This bioactive form supports calcium absorption, bone density, immune function, and muscle strength in older adults.*

Key Benefits of Vitamin D Supplementation

Vitamin D plays many critical roles in the body:

• Bone Health: It aids in the absorption of calcium and phosphorus, two minerals essential for building and maintaining strong bones.
• Immune Support: Vitamin D receptors are found on immune cells, and maintaining adequate levels helps your immune system respond appropriately.*
• Muscle Function: For older adults, vitamin D supports muscle strength, which can contribute to balance and mobility.*
• Overall Wellness: Many cells throughout your body have vitamin D receptors, indicating its broad influence on health.

Who Needs Vitamin D Supplementation?

Certain groups are at higher risk of low vitamin D levels. If you have limited sun exposure—due to indoor work, long winters, or sunscreen use—you may benefit from supplementation. Individuals with darker skin have more melanin, which reduces vitamin D production from sunlight. Older adults' skin becomes less efficient at synthesising vitamin D. Those who follow a vegan diet should note that vitamin D3 from lanolin is not considered vegan; however, this product contains D3 from lanolin. Always check your preferences.

Recommended Dosage and Usage

For most adults, the recommended dietary allowance is 600–800 IU per day, but many experts suggest higher intakes for optimal blood levels. This product provides 2000 IU per capsule—a common maintenance dose. The suggested use is one capsule daily with a meal, as vitamin D is fat-soluble and best absorbed when taken with food containing fat. If you have specific health concerns or are taking medications, consult your healthcare provider to determine the right dosage for you.

Safety and Considerations

Vitamin D is safe at recommended doses. However, extremely high intakes over long periods can lead to toxicity. Do not exceed the recommended serving unless directed by a healthcare professional. If you have conditions like hypercalcemia or kidney stones, consult your doctor before use. As with any supplement, keep out of reach of children. Always read the label and follow directions for use.

What Makes Source Naturals Vitamin D-3 a Quality Choice

Source Naturals has been a trusted supplement brand for over 40 years. This vitamin D3 is manufactured in Scotts Valley, California, under strict Good Manufacturing Practises (cGMPs) established by the FDA. Each batch is tested for purity and potency. The product is non-GMO and gluten-free (as per brand standards, though not explicitly stated on label). With 200 capsules per bottle, it offers a convenient three-month supply at a sensible potency.

This product is not intended to diagnose, treat, , or prevent any disease. Consult a healthcare professional before use.