Easy to drink
5 out of 5 star rating. 
Powerful Free Radical Defence
Antioxidant Power with Isotonix® Vitamin C
1250%
of recommended daily value of vitamin C
7
oranges. 16 lemons. 6 grapefruits.
1
serving of Isotonix Vitamin C
Vitamin C: The World's Most Popular Vitamin
The antioxidant vitamin C reduces free radicals formed in the body. From boosting immunity to promoting skin and eye health, vitamin C is a must-have nutrient.
Product Classification
Gluten-Free
Vegan
Isotonic
Good Manufacturing Practices
How to Take
Step 1
Pour 1 level, white bottle capful of powder into the overcap.
Step 2
Add 2 fl oz/60 mL of water and stir.
Step 3
Enjoy once a day. For maximum absorption, take on an empty stomach.
Key Ingredients & Benefits
Vitamin C
Improves immunity
Improves healing of minor skin wounds
Reduces free radicals formed in the body
Promotes body adaptation to stress
Helps enhance healthy blood circulation
Supports joint mobility
Betacarotene (vitamin A precursor)
Contributes to the maintenance of vision, skin and mucous membranes
Contributes to the normal function of the immune system
Boost Your Immunity
Vitamin C is an antioxidant that reduces free radicals formed in the body. It strengthens the immune system, prevents vitamin C nutritional deficiencies, and helps decrease common cold duration. Only Isotonix offers vitamin C using isotonic delivery, providing maximum nutrient absorption.
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 colour or flavours.
:40 Minutes
Standard Vitamin Tablet
- Contains lab-created coatings and lubricants.
- Often contains artificial colours, nutrients and flavours.
- Limited absorption of nutrient utilisation.
Frequently Asked Questions
What is the RDI of vitamin C? Does Isotonix® Vitamin C provide the RDI?
The RDI for the average adult male and female is 45mg a day. Yes, Isotonix Vitamin C contains 500mg of vitamin C per serving, which is an optimal amount for immune system maintenance. In times of illness or distress it may be helpful to supplement with a higher serving size of vitamin C.
Who needs to supplement with Isotonix Vitamin C ?
Basically, everyone over 18 should use Isotonix Vitamin C. Our bodies do not make vitamin C, and very few of us get the recommended servings of fruits and vegetables in our daily diets. Those who may especially need supplemental vitamin C include the elderly, those with weakened immune systems, smokers, those under heavy amounts of stress, those with cardiovascular conditions and athletes.
Is it possible to take too much vitamin C?
Ascorbic acid is extremely safe even at relatively high levels because most of the excess is excreted in the urine. At high doses (over 1000mg/day), some people can experience gastrointestinal side effects such as stomach cramps, nausea and diarrhoea. It is recommended that you take vitamin C supplements in gradual servings throughout the day to achieve maximum benefits.
Research Scope
Reviews
Break down of ratings: (22) 5 star ratings. (1) 4 star ratings. (0) 3 star ratings. (0) 2 star ratings. (0) 1 star ratings.
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I used to take tablet Vit C before I knew about this product. I nearly choked on it. I'm so glad that my friend recommended this product to me. It is yummy and easy to drink. My young children and my elderly mum (and me, of course!) can consume this easily. :)
Response from Customer Service on 8/4/2025
Thank you for your fantastic review of Isotonix® Vitamin C! We're delighted to hear that you and your family find it easy and enjoyable to drink. It's great to know that our product has become a convenient and pleasant part of your wellness routine. We’re so pleased that your friend recommended it to you and that it's suitable for both your young children and elderly mom. If you have any questions or need further assistance, please don't hesitate to reach out. Thank you for choosing Isotonix and sharing your positive experience with us!
A Game-Changer for My Daily Wellness Routine
5 out of 5 star rating.
I’ve been using Isotonix Vitamin C for a few months now, and I honestly can’t imagine my routine without it.
Response from Customer Service on 8/4/2025
Thank you for your wonderful review of Isotonix® Vitamin C! We're thrilled to hear that it has become an essential part of your daily wellness routine. Knowing that our product has made such a positive change on your life means a lot to us. If you have any questions or need further assistance, please feel free to reach out. Thank you for choosing Isotonix and sharing your experience!
Great product to take on holidays
5 out of 5 star rating.
As you know a lot of people tend to fall sick while travelling, so I take my vitamin c twice a day when I am travelling. Happy to say that I manage to stay fit and healthy throughout my month of travelling!
Response from Customer Service on 8/4/2025
Thank you for your wonderful review of Isotonix® Vitamin C! We're thrilled to hear that it's played a part in helping you stay fit and healthy during your travels. It's fantastic to know that you can rely on our product while exploring new places. Your trust and satisfaction are greatly appreciated. If you have any questions or need further assistance, please feel free to reach out. Thank you for choosing Isotonix and sharing your positive travel experience with us! Safe travels on your future adventures!
Love this product - tastes good and easy to take
5 out of 5 star rating.
I love taking this product with my Isotonix Prime Joint Support Formula as it enhances the potency of pycnogenol or OPC-3 20 times. It boosts my immune system and helps in my skin looking younger as it also promotes skin elasticity.
Response from Customer Service on 8/4/2025
Thank you for your fantastic review of Isotonix® Vitamin C! We're thrilled to hear that you love the taste and find it easy to take. Your satisfaction means a lot to us, and we're delighted to be part of your wellness routine. If you have any questions or need further assistance, please feel free to reach out. Thank you for choosing Isotonix and sharing your positive experience!
LOVE MY ISOTONIX VITAMIN C
5 out of 5 star rating.
AM SO THANKFUL THAT I FINALLY FOUND A VITAMIN C THAT IS IN POWDER FORM SO IS EASY TO TAKE/DIGEST AND IT TASTES GREAT. JUST MIX IT INTO THE SERVE OF WATER WITH MY OTHER ISOTONIX PRODUCTS AND THEN DRINK.😃
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