THE SCIENCE
THE SCIENCE
Vitamin D is a lipophilic prohormone primarily synthesised endogenously through exposure to solar ultraviolet B (UVB) radiation. It can also be obtained in limited quantities from dietary sources. Vitamin D plays a critical role in calcium homeostasis and bone mineralisation. Emerging evidence also underscores the importance of vitamin D in skeletal muscle function. Studies have demonstrated that increasing serum 25(OH)D concentrations from insufficiency (<50 nmol/L) to optimal levels (>75 nmol/L) via Vitamin D3 supplementation (5,000 IU/day for 8 weeks) enhances sprint and jump performance.
For individuals requiring an increase in serum 25(OH)D to support bone health, muscle function, and immune resilience, SiS Vitamin D3 provides a targeted and effective supplementation strategy.
References
1. Close et al (2013). Assessment of vitamin D concentration in non-supplemented professional athletes and healthy adults during the winter months in the UK: implications for skeletal muscle function. J Sports Sci, 31(4): 344 - 353.
2. Owens et al. (2015). A systems-based investigation into vitamin D and skeletal muscle repair, regeneration, and hypertrophy. Am J Physiol Endocrinol Metab, 309(12), 1019 - 1031.
3. Morton et al. (2012). Seasonal variation in vitamin D status in professional soccer players of the English Premier Leage. Appl Physiol Nutr Metab, 37(4): 798 – 802.
4. Close et al. (2013) The effects of vitamin D(3) supplementation on serum total 25[OH]D concentration and physical performance: a randomised dose-response study. Br J Sports Med, 47(11): 692 – 696.
5. Owens et al. (2017). Efficacy of high-dose vitamin D supplements for elite athletes. Med Sci Sports Exerc, 49(2): 349 – 356.