50 Years of Calcifediol Production: Insights from Cor Veldhuizen

Introducing Cor and His Role

Cor, could you introduce yourself and tell us about your role as Global Head of Vitamin D Analogues at CARBOGEN AMCIS?

I am Global Head of Vitamin D Analogues at CARBOGEN AMCIS in Veenendaal, the Netherlands. In this role, I am responsible for the development, optimization and technical support of our vitamin D analogue portfolio, including calcifediol. My work connects R&D, manufacturing, quality, regulatory and commercial functions to ensure that our products meet the highest standards of quality, reliability and customer satisfaction.

How long have you been working in the field of vitamin D analogues, and how has your role evolved over the years?

I have been working with vitamin D analogues for approximately four decades. I started as a laboratory scientist and development analyst, later moving into process development, production support and project management. Over time, my focus expanded from laboratory work to overseeing the complete lifecycle of vitamin D analogue products, from R&D and technology transfer to commercial manufacturing and strategic development.

What does your role involve on a day-to-day basis, and how do you collaborate with the scientific, manufacturing, quality and commercial teams?

My role combines chemical and technical leadership, project management and strategic planning. A typical day may involve reviewing development projects, supporting production campaigns, solving technical challenges, discussing regulatory matters and engaging with customers. Close collaboration between R&D, manufacturing, QC, QA, supply chain and commercial colleagues is essential because the success of our products depends on strong teamwork across all functions.

What first sparked your interest in calcifediol and vitamin D analogues?

What attracted me was the combination of challenging chemistry and meaningful medical applications. Vitamin D analogues require sophisticated synthesis and purification techniques, yet they also contribute directly to therapies that improve patients' lives. That combination of scientific complexity and real-world impact has kept me engaged throughout my career.

Fifty Years of Calcifediol Expertise

CARBOGEN AMCIS produced its first batch of calcifediol in 1976. From your perspective, how has the company’s expertise evolved over the past 50 years?

Our expertise has evolved through continuous learning and innovation. Over the decades we have accumulated extensive process knowledge, analytical expertise and manufacturing experience. At the same time, we have continuously modernized our facilities, quality systems and technologies. Today, we combine decades of know-how with modern pharmaceutical manufacturing standards.

What makes five decades of continuous experience particularly valuable when manufacturing a complex vitamin D analogue such as calcifediol?

Many aspects of vitamin D analogue manufacturing cannot be learned from textbooks alone. Long-term experience provides a deep understanding of process variability, impurity profiles, stability and scale-up behavior. This knowledge enables robust manufacturing processes and consistent product quality, which are critical for pharmaceutical applications.

Looking back at this history, which milestones do you consider the most important?

Important milestones include the successful commercialization of calcifediol, the implementation of increasingly stringent GMP requirements, expansion into global markets, continuous process improvements and the establishment of complete supply-chain control for key raw materials. Each of these developments strengthened our position as a trusted supplier.

Manufacturing and Technical Excellence

What are the main technical challenges involved in manufacturing calcifediol consistently and at the required level of purity?

Calcifediol synthesis requires precise control of chemical reactions (photochemistry!), protection from degradation and advanced purification techniques. Achieving consistent purity levels while maintaining efficiency and yield requires deep process understanding and rigorous analytical control. Small variations can have significant effects, making process robustness essential.

During your career, what have been the most significant developments in calcifediol production processes, analytical technologies and quality control?

Analytical technologies have become dramatically more sensitive and accurate. Modern chromatographic and spectroscopic techniques allow us to detect and characterize impurities at levels that were unimaginable decades ago. Manufacturing processes have also become much more efficient, scalable and reproducible through better process understanding and GMP practices.

How do you and your teams combine long-established manufacturing knowledge with continuous process improvement and innovation?

We view experience and innovation as complementary rather than competing factors. Historical knowledge helps us understand why processes were developed in a certain way, while modern technologies help us improve them. Continuous improvement is embedded in our culture, whether through process optimization, analytical enhancements or manufacturing efficiency projects.

In your opinion, what differentiates CARBOGEN AMCIS’s expertise in calcifediol and other vitamin D analogues?

One important differentiator is the combination of long-term experience and complete supply-chain knowledge. We have been working with vitamin D chemistry for decades and understand not only the finished APIs but also the upstream raw materials, intermediates and production processes. This depth of expertise allows us to provide reliable supply and strong technical support to our customers.

Quality, Regulatory Standards and Supply Reliability

How have regulatory and quality expectations for calcifediol changed over the past five decades?

Regulatory requirements have become significantly more demanding. Expectations around process validation, impurity control, documentation, data integrity and supply-chain oversight have increased considerably. These developments ultimately benefit patients by ensuring higher levels of product quality and safety.

How do you ensure that CARBOGEN AMCIS continues to meet evolving international quality and regulatory requirements?

Continuous investment in quality systems, training, analytical capabilities and process understanding is essential. We closely monitor regulatory developments worldwide and incorporate new requirements into our manufacturing and quality practices.

What role do long-term experience, supply-chain control and business continuity play in ensuring a reliable supply of calcifediol for customers?

They are critical. Long-term experience helps us anticipate and prevent issues before they occur. Supply-chain control improves reliability and quality consistency. Business continuity planning ensures that customers can depend on a stable supply of calcifediol regardless of changing market conditions.

Scientific Research and New Developments

How has scientific understanding of calcifediol and its biological role evolved in recent years?

Recent research has improved our understanding of vitamin D metabolism and demonstrated the importance of calcifediol as a key biomarker and therapeutic option. New studies have also expanded our knowledge of vitamin D's role in immune function, gene expression and overall health.

You have contributed to scientific research involving vitamin D metabolites. How does this research complement your work at CARBOGEN AMCIS?

Scientific research helps us better understand how these molecules function biologically, while industrial manufacturing teaches us how to produce them reliably and at scale. The combination provides valuable insights that benefit both science and pharmaceutical development.

Recent research has explored vitamin D metabolism, gene regulation and obesity-associated vitamin D deficiency. Which developments do you find particularly promising?

I find research into vitamin D-related gene regulation particularly interesting because it helps explain the broad biological effects observed in clinical studies. Increased understanding of vitamin D metabolism in specific patient populations may also support more personalized treatment approaches in the future.

How can an experienced manufacturer such as CARBOGEN AMCIS contribute to scientific progress beyond the production of the active ingredient itself?

Manufacturers contribute by providing high-quality materials for research and clinical studies, sharing technical expertise, supporting process innovation and collaborating with academic and industrial partners. Reliable production capabilities are often a prerequisite for advancing scientific discoveries into practical healthcare solutions.

Market Evolution and Future Perspectives

From your experience, how have customer requirements and the global calcifediol market changed over the years?

Customers increasingly expect robust supply chains, comprehensive technical support, strong regulatory documentation and consistent quality. The market has become more global and more quality-focused, placing greater emphasis on reliability and compliance.

What new applications, technologies or scientific developments could shape the future of calcifediol?

Future developments may include new therapeutic applications, improved formulations and growing interest in personalized approaches to vitamin D management. Advances in analytical science and manufacturing technologies will also continue to enhance product quality and efficiency.

What role will innovation play in the next generation of calcifediol manufacturing processes?

Innovation will remain essential. Future improvements will likely focus on process efficiency, sustainability, impurity control, digitalization and advanced analytical technologies. These innovations will help us maintain competitiveness while supporting the highest quality standards.

As CARBOGEN AMCIS celebrates 50 years of calcifediol production, what are you personally most proud of, and what excites you most about the future?

What makes me most proud is seeing how decades of expertise, commitment and teamwork have established CARBOGEN AMCIS as a trusted supplier of vitamin D analogues worldwide. Looking ahead, I am excited by the continued scientific interest in calcifediol and the opportunity to combine our long heritage with new technologies and innovations to serve future generations of patients.