• Functional Medicine and Immune Testing

    Functional Medicine- science based, patient centered care that uncovers and addresses the root cause of disease.

  • natural medicine berthoud co

    Brain-Gut-Immune Axis

    The inter-relationship and connection between these 3 systems are the fundamental basis of health and optimal wellness.

  • naturopath doctor berthoud co

    Second Look Blood Work

    Confused by the “Normal” finding on your lab work, yet your still sick? Find out why normal isn’t always the best answer.

  • Personalized Medicine

    Using advanced genetic testing and a proprietary system of analysis; we have truly entered into personalized medicine. We can now assess risk factors and nutritional demands based on your unique genome!

Gateway Natural Medicine
& Diagnostic Center

Thanks for visiting Gateway Natural Medicine and Diagnostic Center’s home page. Please take a few minutes to browse our site, and if you have any questions, don’t hesitate to contact us.

Our practice specializes in treating a variety of conditions including internal disorders, chronic back pain, weight loss, headaches, nutritional deficiencies, sports injuries, physical rehabilitation, and well family care. We also provide information about improving your diet and increasing the overall quality of your health.

Our team is committed to bringing you and your family better health and a better way of life by practicing the true principles of balanced care through natural medicine and alternative treatment programs. We are dedicated to your health and well being and understand that choosing a health care professional is an important decision. We appreciate the opportunity to provide you with the highest quality natural health care in the friendliest and most caring atmosphere.


Call us today to schedule your consultation towards a healthier life today.

We look forward to seeing you soon!

Dr. William Kleber

Dr. Brett Wisniewski

Igor Zielinski, LAc



All Gateway Providers are regular contributors to local newspapers. Check out their recent articles.

See our clinic, take the picture tour.

*Due to the Doctor’s teaching schedule we are only open a few select Saturdays a month, please call the office for details.