Viridian Vitamin D4000IU

Viridian Vitamin D 4000iu is a maximum-strength vitamin D supplement providing 4000iu (100 micrograms) of vitamin D3 (cholecalciferol) per capsule, sourced from lichen for vegan suitability. This high-dose formulation is appropriate for individuals who have been identified as vitamin D deficient through blood testing, those in high-risk groups for deficiency, or those who have been recommended high-dose supplementation by a qualified healthcare professional. It is always advisable to have vitamin D levels tested before supplementing at this dose.

Vitamin D deficiency is increasingly recognised as a global health concern with consequences extending far beyond bone health. Research has linked low vitamin D levels to increased susceptibility to infections, autoimmune conditions, cardiovascular disease, depression, metabolic syndrome, and cancer, though the causal nature of these associations continues to be investigated. In clinical practice, high-dose vitamin D supplementation is commonly recommended to correct deficiency states that cannot be resolved through lower doses or sun exposure.

Vitamin D contributes to the normal function of the immune system and may be particularly important for respiratory immune defence, given the high concentration of vitamin D receptors in immune cells. It also contributes to normal muscle function — vitamin D deficiency can cause proximal muscle weakness and increased fall risk in older adults. Bone health requires adequate vitamin D for normal calcium absorption and bone mineralisation, and deficiency contributes to osteomalacia in adults and rickets in children.

The lichen source of vitamin D3 in this product ensures the same biological activity as animal-derived D3. Contains 100% active ingredients, no artificial fillers. Suitable for vegans. Produced in the UK to Viridian's strict ethical standards.