Source Naturals Vitamin D-3 Bioactive Form for Bone and Immune Health 5000 IU - 60 Capsules

Vitamin D is essential for overall wellbeing, especially during the darker months when sunlight is scarce. Source Naturals Vitamin D-3 provides 5000 IU of cholecalciferol per capsule, the form naturally produced by your skin, to help maintain healthy bones and a robust immune system.

Why Vitamin D3 Matters

Vitamin D contributes to many vital functions. It helps the body absorb calcium and phosphorus, which is crucial for bone mineralisation and density. It also supports normal muscle function and plays a key role in regulating the immune response. By ensuring adequate vitamin D levels, you can help your body defend against seasonal threats and maintain strength as you age.

• Bone Health: Promotes calcium absorption and bone mineralisation, supporting skeletal strength.
• Immune Function: Helps regulate immune defences, contributing to normal function of the immune system.
• Muscle Function: Supports normal muscle activity, reducing the risk of falls in older adults.
• Calcium Balance: Works with parathyroid hormone to maintain stable blood calcium levels.

Dosage Advice

The UK government recommends 400 IU (10 µg) of vitamin D daily for the general population, but many adults require higher doses to achieve optimal blood levels. Each Source Naturals capsule delivers 5000 IU, a potent yet common supplementary dose. Vitamin D is fat-soluble, so take it with a meal containing fat for best absorption. It is wise to check your vitamin D levels periodically and adjust your intake under the guidance of a health care professional.

Who Might Benefit?

Low vitamin D levels are widespread, particularly amongst people with limited sun exposure, those living in northern regions, individuals with darker skin, older adults, and those on a vegan diet. Even when you do get sun, factors like sunscreen, clothing, and time of day can reduce natural synthesis. A supplement like Source Naturals Vitamin D-3 helps bridge the gap, making it an excellent choice for anyone seeking to support bone and immune health year-round.

The Difference Between D3 and D2

Vitamin D comes in two main forms: ergocalciferol (D2) from plants and fortified foods, and cholecalciferol (D3) produced in human skin and found in animal products. Evidence suggests D3 is more effective at raising and maintaining blood levels. Source Naturals Vitamin D-3 provides the same form your body generates from sunlight, ensuring efficient utilisation.

What to Look for in a Vitamin D3 Supplement

Quality and purity matter. Source Naturals Vitamin D-3 is manufactured in the USA in a GMP-compliant facility. It is free from yeast, dairy, egg, gluten, soy, wheat, preservatives, and artificial colours, flavours, or fragrances. This makes it suitable for individuals with common sensitivities. The brand has been trusted for over 35 years, reflecting a commitment to high standards.

Safety Considerations

Vitamin D3 is generally safe at recommended doses. However, because it is fat-soluble, excessive long-term intake can lead to toxicity. The safe upper limit for adults is 100 µg (4000 IU) per day, but higher doses may be used therapeutically under medical supervision. Symptoms of excess include nausea, vomiting, weakness, and kidney problems. Always consult your doctor before starting a new supplement, especially if you are pregnant, breastfeeding, or taking medication. This product is a food supplement and should not replace a varied diet and healthy lifestyle.