Isotonix VitC
5 out of 5 star rating. 
The Vitamin C Advantage
105 mg
The recommended daily allowance for vitamin C is 105 mg for adult males.
85 mg
The recommended daily allowance for vitamin C is 85 mg of adult females.
Isotonix® Vitamin C contains 500 milligrams of vitamin C per serving — an optimal amount for immune system maintenance.
Vitamin C, A Widely Recognized Nutrient
Vitamin C (ascorbic acid) is a water-soluble nutrient that provides antioxidant protection and supports a healthy immune system. This vital nutrient helps protect the body against oxidative stress and serves as an important cofactor that maintains skeletal, muscle, cardiovascular, and skin health. It is an ideal everyday choice to complement your diet, support healthy connective tissues like collagen, and fulfill your body's daily nutritional requirements.
Product Classification
Gluten-Free
Vegan
Isotonic
No Detectable GMO
Key Ingredients & Benefits
Vitamin C (Ascorbic Acid)
Provides antioxidant protection
Supports cardiovascular health and the immune system
Serves as a co-factor in the synthesis of collagen
Potassium (Bicarbonate)
An essential mineral that helps to keep fluid balance
Supports nerve and muscle health
Beta Carotene (Vitamin A Precursor)
Can be converted into vitamin A by the body
Helps to maintain healthy eyes and immune system
Antioxidant Support
Isotonix® Vitamin C distinguishes itself on the market, providing rapid and efficient absorption of nutrients upon ingestion. Isotonix® Vitamin C provides enhanced delivery of the nutrients your body needs in a remarkably cost-effective way.
Directions for Use
Pour one small capful (3.3g) of Isotonix Vitamin C powder into your favorite cup.
Mix: Add 2 fluid ounces (60ml) of water per capful and stir until fully dissolved.
Enjoy: Drink once daily on an empty stomach for maximum absorption, savoring the refreshing citrus flavor!
Isotonix Delivery System
:05 Minutes
Isotonix Liquid Vitamins
- Formulated to survive digestion.
- Delivers concentrated nutrients to the site of absorption.
- Contains no fillers or binders.
- No artificial color or flavors.
:40 minutes
Standard Vitamin Tablet
- Contains lab-created coatings and lubricants.
- Often contains artificial colors, nutrients and flavors.
- Limited absorption of nutrient utilization.
Frequently Asked Questions
Can Isotonix® Vitamin C support my immune system?
Yes. Vitamin C is known to be able to support the immune system and is an antioxidant.
Who can supplement with Isotonix® Vitamin C?
Individuals who wish to supplement their diet or those who wish to support their immune system can use Isotonix® Vitamin C. Consumers with pre‐existing conditions should seek advice from their healthcare professionals.
What happens when I take too much Isotonix® Vitamin C?
At high doses (over 1000mg/day), some people can experience gastrointestinal side effects such as stomach cramps, nausea, and diarrhea.
How should I take Isotonix® Vitamin C?
Isotonix® Vitamin C is for ADULT USE ONLY. Pour 1 level, white bottle capful of powder into the overcap. Add water to the line on the overcap (2 fl. oz./60 ml) and stir. As a dietary supplement, take once daily or as directed by your healthcare provider. Maximum absorption occurs when taken on an empty stomach. This product is isotonic only if the specified amounts of powder and water are used.
Reviews
Break down of ratings: (77) 5 star ratings. (7) 4 star ratings. (2) 3 star ratings. (0) 2 star ratings. (0) 1 star ratings.
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Have been taking this product for over 15 years. My wife and I love it. Its an antioxidant and protects and supports my immune system.
Response from Customer Service on 16/2/2026
Thank you so much for your wonderful review! We're thrilled to hear that you and your wife have been enjoying Isotonix® Vitamin C for over 15 years. Your continued support and feedback mean so much to us. Thank you for making Isotonix® a part of your daily routine and for being valued members of our community!
Easy to drink
3 out of 5 star rating.
Easy to absorb as compare to pill. And the taste is good.
Best for Immune Health
5 out of 5 star rating.
I have been taking vitamin C for so many years but this is unlike the rest. My kid no longer fall sick easily after starting this Isotonix Vitamin C. Definitely a great booster for immune health
Repeated purchase
5 out of 5 star rating.
Taste great and easier to take than those pill vitamin c
Great for Skin Health
5 out of 5 star rating.
I like how this Vitamin C doesn't taste too sweet and taking it on a regular basis, i notice my skin looks brighter
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