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O4Nutrition M.D.
Dr. Ahmad Nooristani, with over 15 years of medical experience, leads O4Nutrition M.D., focusing on breakthrough research in alternative medicine and bioavailable nutrition.
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Let customers speak for us
from 94 reviewsI drink this at night a few hours before bed. The first week I didn’t notice much of a difference, but after week two I noticed how much deeper I’m sleeping! How much more relaxed I am at night. I will definitely be keeping this in my routine.
I’ve tried dozens of vitamin powders shakes and pills. O4 Nutrition is by far the best one I’ve ever had!
I tried a few supplements since my surgery, and relax is by far the best. I feel healthier and my mood has improved. I will be sticking with this one
Finding the right supplement after bariatric surgery can be tough. This product has made a noticeable difference in my health. The taste is pretty good too.
My nutritionist recommended this one after my surgery. It's been a few weeks and I feel better. I have more energy and I'm sleeping better. I'm very satisfied with this product
I have noticed that my sleep is better and I feel more relaxed. The calcium and Vitamin D3 are a plus too.
My friend suggested this product after her surgery and I gave it a try after mine. I'm glad I did. My energy is up and I feel like my overall health has improved
After my surgery, I was overwhelmed with nutritional advice. Relax has made it easy. It's got everything I need and I can see the difference in my health. I will keep using this.
My doctor was really stressing on calcium and Vitamin D3 after my surgery. Relax Nutrition has been a game-changer. It's easy to use and I actually enjoy the taste.
Am a few months post-surgery and was looking for a supplement that fits my needs. It came recommended, and am glad I tried it. Energy level is up and I'm feeling pretty good
I started using it after my surgery and it's made a big difference. My energy is up and my digestion has improved. Great product!
This product is a lifesaver and has good price for everything that is included....
After my surgery, I was so confused about what supplements to take. Xtreme Nutrition has made it so easy. It has everything I need, and I feel healthier overall
This is a great product for someone like me who has undergone bariatric surgery and need to supplement good stuff
Fitness Nutrition Line
Designed by Dr. Nooristani, this range aims to offer the ultimate in workout supplementation, supercharged with the all-important element - Oxygen.
Recognized for its key role in body function, our bioavailable liquid Oxygen fuels your cells, supports enhanced energy and stamina, and promotes faster recovery.
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O4N OPower - Activate Stabilized Oxygen - O4Nutrition MD
9 reviewsRegular price $34.00Regular priceUnit price / per -
O4N Revive - O4Nutrition MD
11 reviewsRegular price $36.00Regular priceUnit price / per -
O4N Awakening - O4Nutrition MD
10 reviewsRegular price $36.00Regular priceUnit price / per -
O4N Restoration - O4Nutrition MD
9 reviewsRegular price $36.00Regular priceUnit price / per -
O4N Topical Pain Relief - O4Nutrition MD
7 reviewsRegular price $20.00Regular priceUnit price / per
Find Your Ideal O4N Supplement!
Discover the supplements that suit your lifestyle and health goals best with our insightful quiz.
How Does O4Nutrition Fitness Line Enhance Your Performance?
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Powering Energy Generation
or exceptional performance, your body relies on a process known as aerobic metabolism. This essential process utilizes a steady supply of oxygen to transform glucose into usable energy for your muscles.
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Overcoming Oxygen Shortfalls
During high-intensity exercise, your body might face an oxygen deficit, making it harder for your muscles to maintain optimal performance. This is where O4Nutrition steps in.
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Boosting Performance with O4Nutrition
Our unique formula elevates the oxygen levels in your blood, aiding in more efficient energy production. By extending the duration of the aerobic metabolism phase, O4Nutrition helps to reduce the build-up of lactic acid, often associated with muscle fatigue and discomfort. The result? Enhanced performance, greater stamina, and a faster recovery. Experience the O4Nutrition difference today!
Bioavailable Oxygen in Our Fitness Line:
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Key to Vitality
Bioavailable Oxygen, a core ingredient in our supplements, plays a crucial role in various biological processes, including cellular energy production, which is key for function and recovery.
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Energy Amplified
Our oxygen-infused formulas assist in converting nutrients into usable energy, powering up your stamina and vitality.
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Performance Optimized
The oxygen in our supplements helps enhance muscle function and endurance, empowering you to extend and intensify your workout sessions.
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Swift Recovery
Leveraging oxygen's healing properties, our supplements facilitate tissue repair, promote faster healing, and help clear lactic acid to reduce muscle fatigue and soreness.
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Boosted Immunity
Our oxygen-enriched supplements support a robust immune function, fostering a more effective immune response.
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Maximized Bioavailability
The oxygen infusion in our supplements ensures increased bioavailability, promising maximum efficiency and benefits from each dose.
Complete Nutrition Line
The Complete Nutrition Collection from O4Nutrition is a specially curated range of wellness supplements designed to optimize your health and vitality from the inside out.
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O4N Xtreme Nutrition - O4Nutrition MD
10 reviewsRegular price $55.00Regular priceUnit price / per$65.00Sale price $55.00Sale -
O4N RelaX Nutrition - O4Nutrition MD
8 reviewsRegular price $45.00Regular priceUnit price / per$50.00Sale price $45.00Sale
Learn more about the Complete Nutrition Line:
O4Nutrition M.D. Quality
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Developed Through Sound Science
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Top Rated and Reviewed
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We Test & Re-Test For Quality
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FDA-Registered Facility
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GMP Certified Manufacturing
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Made in the USA
The Complete Nutrition for Post-Bariatric
Experience the power of comprehensive nutritional support with O4Nutrition's Post Bariatric Line. With two uniquely formulated products - Superfood and Calming Formulas - we bring together all the necessary ingredients to promote faster recovery and sustainable health following bariatric surgery. Designed in line with ASMBS guidelines, our supplements are your ideal partners on your post-surgery wellness journey.
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O4N Superfood Formula - O4Nutrition MD
11 reviewsRegular price $55.00Regular priceUnit price / per$65.00Sale price $55.00Sale -
O4N Calming Formula - O4Nutrition MD
9 reviewsRegular price $45.00Regular priceUnit price / per$50.00Sale price $45.00Sale
ASMBS standards, essential nutrients, post-bariatric.
Shop NowBariatric Surgeries: A Nutritional Perspective
Learn More-
Gastric Sleeve
Also known as Vertical Sleeve Gastrectomy (VSG), this surgery reduces the stomach size, leading to potential deficiencies in protein, thiamin, cobalamin, folate, vitamin D, and zinc, often extending to calcium and iron post-surgery.
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Gastric Bypass
This surgery involves restructuring the stomach and small intestine, which could lead to nutrient deficiencies, including protein, thiamin, cobalamin, folate, vitamin D, zinc, and additional deficiencies such as calcium, vitamin A, pyridoxine, vitamin C, iron, and copper after surgery.
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Gastric Band
This procedure restricts the stomach's capacity, and can result in deficiencies in protein, vitamin A, thiamin, pyridoxine, cobalamin, folate, vitamin C, vitamin D, zinc, and selenium, often adding calcium and iron deficiencies post-surgery.
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Duodenal Switch
This surgery reduces stomach size and reroutes the intestines, leading to potential deficiencies in protein, vitamin A, thiamin, pyridoxine, cobalamin, folate, vitamin C, vitamin D, vitamin E, zinc, selenium, and additional deficiencies such as calcium, iron, vitamin K, magnesium, and potassium after surgery.
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Gastric Balloon
This procedure restricts the stomach's capacity, potentially causing deficiencies in protein, vitamin A, thiamin, pyridoxine, cobalamin, folate, vitamin C, vitamin D, zinc, selenium, and typically additional deficiencies in calcium and iron post-surgery.
Learn more about the Bariatric Nutrition Line:
O4Nutrition Wellness Team
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Hailey Esdaile
Registered Dietitian
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Cece Catena
Registered Dietitian
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Christopher Taglias
MD, FACS, DABOM
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Dr. Ahmad Nooristani
MD & Founder of O4Nutrition
Join Our Wellness Ambassadors
Be part of our passionate advocates' community that trust O4Nutrition for their journey towards optimal health and fitness.
MD Insights Blog
View all-
Ahmad Nooristani: A Physician's Journey in Heal...
Ahmad Nooristani: A Physician's Journey in Healthcare Innovation and Service Born on August 1, 1975, in the bustling city of Kabul, Afghanistan, Ahmad Nooristani has emerged as a dedicated physician,...
Ahmad Nooristani: A Physician's Journey in Heal...
Ahmad Nooristani: A Physician's Journey in Healthcare Innovation and Service Born on August 1, 1975, in the bustling city of Kabul, Afghanistan, Ahmad Nooristani has emerged as a dedicated physician,...
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An Insight into the Life and Work of Dr. Ahmad ...
An Insight into the Life and Work of Dr. Ahmad Nooristani: A Q&A Session As we delve into the life and accomplishments of Dr. Ahmad Nooristani, it becomes apparent how...
An Insight into the Life and Work of Dr. Ahmad ...
An Insight into the Life and Work of Dr. Ahmad Nooristani: A Q&A Session As we delve into the life and accomplishments of Dr. Ahmad Nooristani, it becomes apparent how...
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Navigating the Blood Sugar Roller Coaster
Navigating the Blood Sugar Roller Coaster: Smart Food Choices and O4N Supplements for Stable Levels By Dr. Ahmad Nooristani Think of your body as a car and blood sugar as...
Navigating the Blood Sugar Roller Coaster
Navigating the Blood Sugar Roller Coaster: Smart Food Choices and O4N Supplements for Stable Levels By Dr. Ahmad Nooristani Think of your body as a car and blood sugar as...
Meet Your Best Self with O4Nutrition MD
Nourishing Your Body, Elevating Your Health
Experience the Power of Science-Driven Nutrition
Nourishing Your Journey to Optimal Health
O4Nutrition Apparel Collection
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Longline sports bra
Regular price $40.00Regular priceUnit price / per -
Stainless steel tumbler
Regular price $25.00Regular priceUnit price / per -
Unisex organic cotton t-shirt
Regular price $25.00Regular priceUnit price / per
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Create your account now and receive a 100-point signup bonus as a welcome gift!
Shop By Your Goals
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Fitness Nutrition
Shop NowElevate your athletic performance with our specially-formulated sports nutrition supplements
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Complete Nutrition
Shop NowMeet the nutritional demands of your busy life with our comprehensive, bioavailable supplements.
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Bariatric Nutrition
Shop NowSupport your bariatric journey with our tailored, easily absorbable, nutrient-rich supplements.