Approximately 1 billion people worldwide suffer from vitamin D deficiency (Ref 4), particularly office workers and residents of high-latitude regions. Key causes include:


1）Insufficient Sun Exposure: 90% of vitamin D is synthesized via UVB rays, but modern lifestyles limit outdoor time to <30 minutes daily (Ref 5).

2）Limited Dietary Sources: Few foods naturally contain vitamin D (e.g., wild salmon, egg yolks), and cooking often degrades its potency.

3）Absorption Variability: Fat-soluble vitamin D requires dietary fats for optimal uptake, yet many products use suboptimal formats (e.g., tablets vs. softgels).


Science-Backed Supplementation:

1）Test First: The Endocrine Society recommends serum 25(OH)D levels ≥30 ng/mL (Ref 6). Test before supplementing.

2）Personalized Dosing: A daily 1,000–4,000 IU is safe (Ref 7). Our D3+K2 softgels offer flexible dosing.

3）Synergistic Nutrients: Added vitamin K2 (MK-7) directs calcium to bones—not arteries (Ref 8).


References:
4. Holick, M.F. (2017). "The Vitamin D Deficiency Pandemic." Endocrine Reviews. [PubMed]
5. CDC. (2022). "NHANES Data Brief on Sun Exposure." [Link]
6. The Endocrine Society. (2021). "Vitamin D Clinical Guidelines." [Link]
7. NIH. (2023). "Vitamin D Fact Sheet." [Link]
8. Knapen, M.H.J. et al. (2015). "Vitamin K2 Improves Bone Strength." Osteoporosis Int. [PubMed]