ZanthoSyn™ Astaxanthin | GNC

Cardax ZanthoSyn™ Astaxanthin


Item # 539600

Product Information



Safe Anti-Inflammatory for General Health*
Astaxanthin Supplement

ZanthoSyn™ is a pure and highly absorbed form of astaxanthin recommended by healthcare professionals.
Astaxanthin is a clinically studied ingredient with safe anti-inflammatory activity that supports:
  • Joint Health*
  • Liver Health*
  • Cardiovascular Health*
  • Metabolic Health*


Nutrition Facts
Serving Size  1 Capsule(s)
Servings Per Container  60

Amount Per Serving     % DV

Astaxanthin  12 mg   **

** Daily Value (DV) not established.
Other Ingredients
Modified Food Starch, Tapioca (Capsule), Microcrystalline cellulose, Corn Starch, Glucose Syrup, Sodium Ascorbate, DL-Alpha-Tocopherol
Label (click image to enlarge)

How To Use

As a dietary supplement, take 1 capsule daily with food or as directed by a healthcare professional.
Do not use if safety seal is broken or missing. Consult your physician before use if you are pregnant, nursing, taking medication, or have a medical condition. Store in a cool, dry place
Distributed by: Cardax, Inc.
Honolulu, HI 96822


4.5 / 5.0
15 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Excellent anti inflammatory product
It has helped my husband tremendously - he used to have very achy hands, wrists. He works a lot in the garden, and these aches are gone.Write your review here. It must be at least 10 characters long. Consider whether you would recommend this product and what you like or dislike It has helped my husband tremendously - he used to have very achy hands, wrists. He works a lot in the garden, and these aches are gone. it. If you are experiencing an adverse reaction to a product purchased from GNC, please call 1-800-420-6983. If your pet is experiencing an adverse reaction to a GNC brand Pets product, please call 1-866-257-2602.
June 9, 2018
1 year ago
My husband has inflamation thorough out his body and has been taking this product since the end of March. He takes 3 pills a day but it doesn't seem to be making any difference in pain relief.
May 15, 2018
5 months ago
ZanthoSyn and weightlifting by an "old" guy
I take ZanthoSyn every morning along with some omega-3 (good fats to help with metabolizing). I am 70 and believe that, even in the short time that I've taken ZanthoSyn, it has made a difference in my weightlifting performance; I just seem to have more energy and realize a better recovery. My much younger wife takes it too! We're glad we discovered ZanthoSyn.
May 12, 2018
5 months ago
Finally! Pain relief without NSAIDs
For years I took Motrin and Tylenol to relieve my aching neck and upper back. Then I added Tiger Balm and Horse Liniment to my treatment plan. Between all of that and the occasional ice pack, I was able to avoid being a total grouch. ZanthoSyn has replaced all of that! I was skeptical at first, but one of my friends told me about his experience. Pain relief without all of the stomach irritation. I am unsure about all of the other health benefits, but as long as my neck and back feel good, that is all that matters to me!
March 30, 2018
11 months ago
A must try!
Helped with my joint swelling in hands and feet. Results in a week. I recommend this highly.
March 21, 2018
7 months ago
A wonderful product
Fantastic! Will continue to use this product...
March 17, 2018
7 months ago
It's only 2 weeks that I have been taking ZanthoSyn so I will be back.
January 20, 2018
9 months ago
I have an arthritic knee with no ACL. I take two capsules daily with breakfast. If I stop taking the pills, after three days I feel like the “Tin-Man” in the Wizard of Oz...this stuff works and allows me to recover quicker from weightlifting workouts.
January 1, 2018
Great product with great results
October 10, 2017
1 year ago
Best anti-inflamatory product on market
Everything I've read shows this product is the best for any active person. I'm 58yrs old and still play 4 full-court games of basketball once a week. My sprains rarely occur and my healing time is generally little over 2 weeks (I used to get sprains about 6 times a year and it would normally have taken about 6 weeks for me to get back on the court). Used to take advil or other ibprophens, all caution against side affects. Zanthosyn studies have shown no side affects and much higher doses than what I'm taking (only one per day, but thinking of upping to 2/day ). Nature identical properties prepared synthetically seems to make more sense than the natural product so it's always consistent. I also understand it is 2.8 times more absorbtion of the active ingredient, asthazanthin, into your system than the natural product.
September 20, 2017
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 4 questions Browse 4 questions and 9 answers
Is this like Bioastin?
Karen L on Mar 28, 2018
BEST ANSWER: Yes, they have the same active ingredient listed. I have been taking ZanthoSyn since Nov 2017 and it has greatly improved my sore neck and upper back. Please note that it took about two weeks of taking one capsule every day to feel relief. One of my friends had to take four per day for one week to experience the same effect. But now he only takes one capsule every other day. Good luck! And I hope you feel better real soon!
Does ZanthoSyn contain fish oil?
A shopper on Jun 9, 2018
BEST ANSWER: Fish oil is not listed as an ingredient.

From the label: 1 capsule contains 12 mg of astaxanthin, along with Modified Food Starch, Tapioca Capsule, Microcrystalline Cellulose, Corn Starch, Glucose Syrup, Sodium Ascorbate, and DL-Alpha-Tocopherol. Vegan friendly and Non-GMO. If you are concerned about any of these, you can look them up, but my wife and I have had very good results with this product.
Would this be good for back problems?
A shopper on Apr 8, 2018
BEST ANSWER: I take it for my knee pain and it has relieve the pain.
what source is the astaxathin?
A shopper on Oct 10, 2018
BEST ANSWER: manufactured by Cardax as the complete chemical substitute, exactly the same, except the compound is 100% reasonable vs the plant based products that are at best, 10% absorb able.. Company founded by a very respected cardiologist who wrote the Heart Letter for the Cleveland Clinic as the exact duplicate of the natural product found in nature in micro algae eaten by krill, then salmon, then whales, etc., whales, etc. rjr