A Different Kind of
Healthcare Experience

“My husband and I are in our mid 50s and between us we have a number of chronic health problems including serious allergies, diabetes and neuropathy, high blood pressure, high cholesterol, joint pain, and post-menopausal symptoms. In the relatively short time we've been seeing Dr. Brett and taking supplements he's recommended, we have both seen great improvements in our overall health and wellness. He is extremely knowledgeable, and caring, and he takes the time to really listen and work with his patients. We both have Ph.D degrees and work in a medical field, so we are very discriminating about who we see for healthcare, but we highly recommend Dr. Brett and Gateway Natural Medicine.”

— Carol

“Dr. Brett has great 'bedside manner' whether talking face to face or on the phone. He's genuinely interested in my well-being and I can tell he listens to what I say. He isn't biased towards one drug or another, but is biased towards patient health. I can tell from my interactions that his primary goal is my well-being. I feel confident in his knowledge and skill and that he cares for his patients. I'd recommend anyone to see/call him with their health needs.”

— Ben

“Every time I'm at Gateway I feel respected and cared for. I get my doctor's full attention and don't feel rushed. Most of all I know that it's not just my symptoms that are being treated, but also my whole body. I can trust that all the supplements I'm taking are natural and aren't harming my body, but helping my immune system to do a better job at keeping me healthy.”

— Kasha

“Working with Dr. Brett has been a life-changing experience for me. My whole life I have felt tired, lethargic, and just 'out of it.' I never knew that this was abnormal because I had felt like this my whole life. Then it started progressively getting worse and I was sleeping my life away. When I finally started working with Dr. Brett he went through such an extensive discovery with me and he really took the time to listen and answer any questions that I had. I've been working with Dr. Brett for 3 months now and I feel so much better. I have energy, I feel alive, and I am motivated to do things besides just waiting until I can lay down again.”

— Casey

“I have been working with Gateway Natural Medicine under the care of Dr. Wisniewski for 5 months. I have only positive comments to share and great respect for all the staff and services offered. His approach of following where the science leads, using and teaching his extensive knowledge base, and avoiding unnecessary testing and cost, has helped me greatly in my journey of healing. The entire office is professional and positive, especially when one is dealing with the fear and stress of an illness.”

— Christina

“Dr. Kleber has been a constant presence and friend in helping our family achieve good health over the years through multiple challenging situations. His knowledge and flexibility have helped us to navigate multiple health situations ranging from asthma to back problems and beyond – all to a successful result. We have also been very pleased with the addition of Dr. Brett to the Gateway team. If you are searching for health care providers you can trust…these guys are the real deal.”

— Thomas

“I appreciate the time and attention given to me as a patient and have recommended Dr. Kleber and Dr. Brett to several family members and friends.”

— Kris Thompson

“I am very happy with the treatment I have received at Gateway Natural Medicine. The office and nursing staff are always friendly and accommodating. There is never a long wait for appointments. Usually no longer than 5 minutes. Dr. Kleber is very personable and takes plenty of time to listen to how I am feeling. He takes great care in planning my treatment on a natural basis.”

— Jane

“Love Gateway Natural Medicine! Not only is Dr. Brett knowledgeable in what he does, he is also very good communicating this knowledge to his patients. He takes time to listen, care, and explain. And love the other staff too! They are very eager to help and serve.”

— Michelle, CO

“Since I've started visiting the Gateway Natural Medicine & Diagnostic Center, I've been experiencing relief from conditions I thought I'd be stuck with for the rest of my life. Now I have started thinking of other ways the Center can help me achieve better health for other conditions I need improved instead of trying not to hurt too much. That spells a better game altogether and for that I am grateful to Brett and the staff. You guys rock!!!”

— Bruno, Berthoud, CO

“I have been a patient at Gateway Natural Medicine for 9 years. Dr. Kleber was able to successfully diagnose and treat my symptoms where traditional medicine failed for many years. The demeanor of the staff and the overall atmosphere is very comforting, you forget you're at a health care facility. I encourage anyone that is not getting the level of care they want from their health care provider to make an appointment at Gateway Natural Medicine.”

— Jake

“Dr. Brett has been such a wonderful medical resource for me! I value his knowledge and approach! From my first evaluation appointment to present, Dr. Brett and his staff have been fantastic! Always willing to help with SUCH amazing knowledge!”

— Tracy

“Gateway Natural Medicine provides high quality health care. The office staff are friendly and knowledgeable. They are able to handle most any situation with the patients! Dr. Kleber makes each patient feel like they are the most important person. He listens, really listens, to patients. He recognizes how important it is to gain the trust of his patients. He provides his patients with state-of-the-art medical treatments that help restore the body to the highest degree of health possible.”

— Margaret

“The staff are very friendly and helpful. They consistently go above and beyond to keep me educated and informed in all areas of my healthcare. Dr. Kleber goes out of his way to help me achieve optimum health and works to help me understand and feel listened to as he plans my health care regimen.”

— Elizabeth

“Dr. Brett is one of the best things that has ever happened to me! I had heatstroke and came dangerously close to death. Which left me with a basket full of health, sensory and movement issues. He was 100% on the same page with me at all times and knew exactly what to do to correct the Issues I was having. It has been two weeks and I am easily 85% better after a year and a half of suffering. I am SO blessed to have Dr. Brett helping me!”

— Alicia

“I have had the privilege of knowing and working with Dr. Brett for several years. I trusted him with the care of my mother when she had issues that needed special attention. He is very skilled and knowledgeable. You are in good hands while you are in his office or under his care.”

— Dr. Chris

“I appreciate the individual care I get from everyone at Gateway Natural Medicine, from Dr. Brett to all the support staff. I never feel rushed at any of my appointments — my concerns are addressed as well as my overall progress. The treatments are very specific to me — there's no 'cookie-cutter' or 'one-size-fits-all' solution. I also really like that I don't get a ton of expensive new and different supplements prescribed every visit. Dr. Brett is really working with me to correct the source of my physical problems, rather than just treating the symptoms.”

— Mary

“Everyone at this clinic is extremely helpful and knowledgeable. The doctors actually care about your continued health.”

— Josh, NY

“My 15-year-old daughter has CP, which obviously causes issues on its own. We contacted Dr. Brett for help with this, but also because she was suffering from SEVERE (24/7) anxiety issues and a few other health concerns. After talking with him and having her undergo an in-depth urine and saliva test, he suggested diet changes and some supplements. We noticed a difference within days. AMAZING! We have been doing this for about a month and her anxiety has decreased by about 70%.”

— Debbie White, Port Orange, FL

“Dr. Wisniewski has provided me with excellent care by taking a detailed account of all of my concerns. I appreciate his ability to identify the primary factors that need to be addressed first. His nutritional and supplemental recommendations allowed me to begin feeling significantly better within the first 1-2 weeks of his care.”

— Michelle, CO

“My appointments are always on schedule, professional and enjoyable. The entire staff is great. Dr. Kleber has my best interest in mind, period.”

— Brad

“When Dr. Wisniewski moved from Florida to Colorado, we were so disappointed. Though we still miss him being local, the level of care my husband and I have received has continued to be great. Where our 'regular' doctor primarily prescribes medications, Dr. Wisniewski is excellent at looking for the root of the problem. Gateway is also great at getting supplements to us in a timely fashion as well as being quick to respond when we contact them.”

— Nancy, FL

“I have had nothing but positive experiences with Dr. Brett at the Gateway Natural and Diagnostic center. Dr. Brett consistently answers all my questions with explanations that I understand and many times diagrams. I started going to Dr. Brett for terrible sinus infections, which he has treated without drugs of any kind. He is now treating me with supplements for total body health. I highly recommend Dr. Brett - GO NATURAL.”

— Chrisie, FL

“Dr. Kleber genuinely cares for his patients and is constantly trying to determine the most direct approach possible to address the source of the problem. He treats each patient as an individual with unique needs and doesn't use cookie cutter treatments or 'band aid' methods that only mask symptoms.”

— Holly, CO

“The Drs at GNM discovered the real culprit to my high TSH level and cured it. It was not thyroid as all other drs thought, they were able to take me off the synthroid and truly solve the problem! They listened to my whole medical story and cared for me like a human being. They are what all medicine should be like!”

— Cassi, CO