Product review

I purchased this because because I have been working on my computer and phone zooming more than ever and have noticed more eye strain. I have noticed a difference in juat a few days. Tastes great too. *This is a review from a SHOP Consultant

Bill W.
Key Benefits of Isotonix® Astaxanthin
  • Supports cardiovascular health
  • Helps maintain normal blood pressure
  •  Promotes healthy vision
  • Provides powerful antioxidant defense
  • Supports a healthy digestive tract

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Single Box (30 Packets)

SKU: 14505

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Primary Benefits* of Isotonix® Astaxanthin

Give your body the protection it deserves with this powerful antioxidant defense.

  • Supports cardiovascular health
  • Helps maintain normal cholesterol levels by helping to maintain normal serum triglycerides and HDL cholesterol levels
  • Promotes healthy blood flow to and from the heart, supporting the body’s delivery of nutrients and removal of wastes
  • Helps maintain normal blood pressure
  • Protects LDL (bad cholesterol) from oxidative stress, which promotes healthy arteries
  • Promotes healthy vision
  • Helps to fight the effects of oxidative stress in the eye
  • Helps reduce the occurrence of occasional eye fatigue and eye strain associated with visual electronics
  • Supports healthy blood flow in the eye, promoting nourishment for the eye and helping to maintain proper eye function
  • Supports healthy visual focus
  • Supports healthy visual accommodation
  • Provides powerful antioxidant defense
  • Supports epigastric health
  • Supports gastrointestinal tissue health and gastric function
  • Supports a healthy digestive tract
  • Supports gastrointestinal immune functions
  • Helps maintain the epithelial structure and barrier function
  • Promotes healthy skin by improving skin moisture and helping to maintain skin elasticity
  • Supports muscle endurance and muscle performance by protecting the skeletal muscle from oxidative stress generated by physical activity

Containing AstaREAL® Astaxanthin

What Makes Isotonix Astaxanthin Unique?

Isotonix® Astaxanthin’s vegan formula uses AstaReal®† astaxanthin—with quality and stability, AstaReal® astaxanthin ranks among the purest and most powerful antioxidants available. AstaReal® uses precision cultivation techniques in state-of the-art facilities, producing astaxanthin from Haematococcus Pluvialis, a freshwater microalga, in a purified and sterile environment.* This proprietary process allows it to be fully cold-water soluble in seconds while remaining lightly flavored and easily digested. In addition to 6 mg Astaxanthin, each serving contains 7 mg natural vitamin E and 120 mg of acerola (25% vitamin C), providing additional antioxidant benefits.*

Absorption and efficacy of nutritional supplements are two important features to examine when selecting a nutritional supplement, and Isotonix Astaxanthin contains both. “Isotonic,” which means “same pressure,” bears the same chemical resemblance to the body’s blood, plasma and tears. Isotonix Astaxanthin is readily available to support the body’s metabolism due to its isotonic state, allowing the fluid to enter the body and travel through the small intestine with minimum exposure to stomach acids that may degrade or limit nutrient concentration. An isotonic fluid is an efficient nutrient delivery system.

Daily exposure to free radicals—contained within the air we breathe and the food we eat— can sometimes result in oxidative stress. Oxidative stress is caused by free radicals’ impact to all systems of the body is also believed to be a primary contributor to what we call the aging process. Isotonix Astaxanthin works to neutralize free radicals by providing powerful antioxidant defense to help protect at a cellular level.* Isotonix Astaxanthin sets itself apart from other products because we use algae, not shellfish. This provides you with a vegan and gluten-free formula, conveniently packaged in a ready-to-go stick pack. In addition, it is a fully soluble powder! On top of its unique formula and convenience, the Isotonic delivery provides the efficient absorption of the nutrients within the product. In today’s high-demand world, your body could benefit from a boost of antioxidants. Astaxanthin helps to protect the entire body. *

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

AstaReal® is a registered trademark of Fuji Chemical Industry Co., Ltd.

Product Classifications

Product Classifications

Gluten-Free - The finished product contains no detectable gluten (<10ppm gluten)

Vegan - This product is made without ingredients produced by or derived from animals

Isotonic-Capable Drinkable Supplements - Easy-to-swallow supplements in liquid form are immediately available to the body for absorption

Quality Standards - GMP Operations and Standardized Ingredients

Checked For: Heavy Metals, Microbiological Contaminants, Allergens, Residual Solvents, Potency, Purity and Identity

Key Ingredients

Astaxanthin (AstaReal®)
Astaxanthin is a carotenoid that gives the reddish pigment to some algae, salmon, crab, krill and lobster. It is known for its powerful antioxidant effects and has been shown to be a superior free radical quencher when compared to other antioxidants like coenzyme Q10 and green tea. AstaReal®† provides 6 mg of sustainably sourced Astaxanthin from Haematococcus Pluvialis.* Astaxanthin is known to be a powerful antioxidant with an affinity for tissues that have heightened metabolic demand such as cardiac muscle, capillary beds within organs and skeletal muscles requiring sufficient oxygen and energy for their proper performance.* A significant number of human clinical studies demonstrate the efficacy of astaxanthin on cardiovascular health and performance. Research reveals an impressive link between natural astaxanthin from algae and normal healthy levels of HDL, a form of lipid respected for its cardio-protective benefits. In addition, astaxanthin supports normal vascular tone and performance, making astaxanthin a critical addition for those looking to maintain normal blood pressure as well as those looking to promote physical endurance.* With exercise comes the creation of free radicals. Specifically, singlet oxygen free radicals. These radicals are particularly problematic in aging and cellular endurance. Meaning, with age comes a slowing down of our ability to quench these free radicals as fast as they are produced.

Athletes and those that exercise regularly, regardless of age, create these free radicals at a significant rate. Individuals in both groups may benefit from a nutritional intervention of AstaReal® Astaxanthin to meet their metabolic demands. Using a powerful antioxidant like astaxanthin helps us maintain balance, and support healthy energy, stamina and cardiovascular health.* In addition to its cardiovascular, metabolic and physical fitness benefits, AstaReal® Astaxanthin supports healthy visual activity. Loss of visual accommodation, the ability to focus on small objects or near objects, is not limited to an aging population. In fact, with digital devices becoming more and more prominent in our lives, it’s becoming more difficult to maintain our ability to properly accommodate. Overstimulation of our eyes, from the growing number of screen and digital interfaces, can leave our eyes feeling tired. Such fatigue can impact both visual focus and cognitive attention. Astaxanthin, because it has dual purpose of protecting the eyes from eye strain while promoting normal blood flow to retinal and surrounding tissue supports the eyes ability to read and use devices for longer periods of time with less eye fatigue. AstaReal® astaxanthin, because of its unique shape, additionally supports the body’s ability to quench free radicals and fight the effects of oxidative stress in the eye.* 

Vitamin E (d-alpha tocopherol)
Vitamin E is a family of related compounds called tocopherols and tocotrienols. Vitamin E is available in both naturally occurring and synthetic forms. The naturally occuring form of alpha-tocopherol is known as "d-alpha tocopherol." While the synthetic form, "dl-" is the most common form found in dietary supplements, Isotonix Astaxanthin uses the naturally occurring form because research shows it is better absorbed and retained in the body, making it the better choice for heart health and metabolic well-being.* Vitamin E is one of the most powerful fat-soluble antioxidants in the body, allowing it to protect cell membranes from free radicals. Vitamin E quenches a different type of free radical than astaxanthin or water-soluble antioxidants, which pairs perfectly with Astaxanthin. Isotonix Astaxanthin uses vitamin E and astaxanthin because, not only do these two ingredients enhance each other’s free radical quenching capabilities, they are physiologically similar to the natural components making up our cell membranes. Together they support stability and health of the cell membrane. Collectively, vitamin E and Astaxanthin have the unique benefit of supporting the health of the entire cell.* Putting vitamin E in the Isotonix Astaxanthin offers additional benefits. Vitamin E and Astaxanthin are supportive of gastro-intestinal barrier health and immune function. Both vitamin E and Astaxanthin’s contribute to a healthy barrier membrane because of their shape and ability to help fight the effects of oxidative stress.* According to studies, vitamin E, a tissue-specific antioxidant, may also support macular health.*

Acerola Fruit Extract (25% Vitamin C)
Acerola fruit are packed with a variety of nutrients and are one of the richest natural sources of vitamin C. We know the naturally occurring forms of vitamin C have a longer half-life than synthetic forms while also having improved bioavailability. By using the whole fruit of acerola, the potent antioxidant activity improves Isotonix Astaxanthin because the fruit contains an abundance of other phytonutrients like carotenoids phenolics, anthocyanins and flavonoids. These compounds carry their own health benefits and support absorption of vitamin C into the bloodstream and the liver.* Utilizing Isotonix Astaxanthin for skin health and free radical protection is an essential part of beauty from the inside regardless of age.*

Potassium (Bicarbonate)
Potassium is an essential micromineral that helps to maintain a healthy electrolyte balance in the body. Potassium additionally contributes to the Isotonix advantage supporting healthy fluid balance and exchange. In addition to supporting optimal nutrient transport in the Isotonix® line, allowing the Isotonix® line to use food-based ingredients instead of solvents and binders, potassium also plays a role in a wide variety of biochemical and physiological processes.*


  1. What is Astaxanthin?
    Astaxanthin is a carotenoid that gives the reddish pigment to some algae, salmon, crab, krill and lobster. Isotonix Astaxanthin uses a fully sustainable source of red pigmented algae. Because it is from algae it allows the Isotonix® Astaxanthin to be suitable for a vegetarian or vegan diet. Astaxanthin is a powerful antioxidant and it does not become a pro-oxidant. This means, even under tremendous oxidative stress, astaxanthin does not create free radicals from itself or its metabolism. Other carotenoids like vitamin A, lycopene and zeaxanthin, on the other hand, may become free radicals when taken in supraphysiologic amounts.*

  2. Where is the astaxanthin in Isotonix Astaxanthin sourced?
    This product uses only AstaReal®† Astaxanthin, which is manufactured from carefully cultivated microalgae (Haematococcus pluvialis) in state-of-the-art facilities. In contrast to generic varieties, AstaReal® astaxanthin is unsurpassed for quality control and consistency in manufacture. AstaReal® astaxanthin is frequently selected for clinical research and testing in nutritional applications. AstaReal® Astaxanthin has 14 patents over a span of several areas of health, making AstaReal® your only choice in quality astaxanthin.

  3. Who should take Isotonix® Astaxanthin?
    Due to the diversity of benefits, Astaxanthin is appropriate for any individuals looking for powerful antioxidant defense for their heart and eyes, as well as support for muscle endurance and performance, skin elasticity and gastrointestinal health.*

  4. What is the recommended serving of Isotonix Astaxanthin?
    The recommended serving for adults over the age of 18 is one serving per day, which provides 6mg of astaxanthin.

  5. Is Isotonix Astaxanthin suitable for use by both men and women?
    Yes. Astaxanthin is beneficial for both men and women. Please read the product label for any product warnings.

  6. Does Isotonix Astaxanthin need to be taken on an empty stomach?
    All Isotonix products are formulated for efficient delivery of nutrients or components when taken as directed. Because astaxanthin and vitamin E are fat soluble antioxidants, taking Isotonix Astaxanthin with a meal is permissible and will not impact the effectiveness of the ingredients.*

  7. Which products are best combined with Isotonix® Astaxanthin?
    Isotonix Astaxanthin has multiple benefits and can be combined with products such as Isotonix® Resveratrol for those looking for increased cardiovascular support, Isotonix® Vision Formula for those looking for healthy vision, Isotonix® Coenzyme Q10 for maintaining healthy cholesterol levels and Isotonix OPC-3® for maximum antioxidant protection.*

  8. Why did we choose to combine 3 powerful antioxidants in the Isotonix® Astaxanthin formula?
    We paired these 3 antioxidants specifically because they work in synergy, protecting both sides of the cell membrane—TWO being fat-soluble and the other being water-soluble. Additionally, these three ingredients enhance the power of their partners. Individually, each ingredient has its own strength, yet together the three can quench a varied number of free radical types while effectively recycling one another for maximum protection.*

  9. What is the significance of Isotonix Astaxanthin being cold-water-soluble?
    Unlike many competitors, Isotonix Astaxanthin is cold water-soluble and in a powdered form. Not only is cold-water-soluble astaxanthin a temperature-controlled extraction, the cold-water soluble powder offers a higher concentration of astaxanthin by weight while also dispersing well water without clumping or sticking, making it ideal for on-the-go activities or travel. In addition, the cold-water-soluble AstaReal® Astaxanthin is a free-flowing powder, allowing for enhanced delivery in a pure vegetable formula.

  10. What differentiates Isotonix Astaxanthin from Prime Astaxanthin?
    Isotonix Astaxanthin is a vegan and gluten-free formula that features 3 powerful antioxidants that work in synergy to protect both sides of the cell membrane—two being fat-soluble and the other being water-soluble. Isotonix Astaxanthin provides you with efficient absorption of the nutrients within the product. Isotonix Astaxanthin can be taken with your daily Isotonix while you can take Prime Astaxanthin later if you want the benefits of 12 mg of pure AstaReal® Astaxanthin.*

  11. What is the best way to store this product?
    Keep Isotonix stored in a dry, cool place. If Isotonix are stored in the kitchen, keep them away from the stove, sink, heat-generating appliances or window ledges. If you live in a very humid area, you may store Isotonix products in the refrigerator – but not in the fruit and vegetables area.


  • Aoi, W., et al. Astaxanthin improves muscle lipid metabolism in exercise via inhibitory effect of oxidative CPT I modification. Biochem. Biophys. Res. Com. 366:892–897, 2008.
  • Camera, E., et al. Astaxanthin, canthaxanthin and beta-carotene differently affect UVA-induced oxidative damage and expression of oxidative stress-responsive enzymes. Exp Dermatol. 18(3):222-31, 2009.
  • Cardoso, P. C., Tomazini, A. P. B., Stringheta, P. C., Ribeiro, S. M., & Pinheiro-Sant’Ana, H. M. (2011). Vitamin C and carotenoids in organic and conventional fruits grown in Brazil. Food chemistry, 126(2), 411-416.
  • Choi et al. Effects of astaxanthin on oxidative stress in overweight and obese adults. Phytother Research (in-press), 2011.
  • Choi, H. D., Kim, J. H., Chang, M. J., Kyu‐Youn, Y. and Shin, W. G. (2011), Effects of Astaxanthin on Oxidative Stress in Overweight and Obese Adults. Phytother. Res., 25: 1813-1818. doi:10.1002/ptr.3494
  • Chyun, J. H., & Kim, Y. K. (2004). The Effects of Astaxanthin Supplements on Lipid Peroxidation and Antioxidant Status in Postmenopausal Women. Nutritional Sciences, 7(1), 41–46.
  • De Rosso, V. V., & Mercadante, A. Z. (2005). Carotenoid composition of two Brazilian genotypes of acerola (Malpighia punicifolia L.) from two harvests. Food Research International, 38(8-9), 1073-1077.
  • Earnest, C. P., Lupo, M., White, K. M., & Church, T. S. (2011). Effect of astaxanthin on cycling time trial performance. International Journal of Sports Medicine, 32(11), 882-888.
  • Ikeuchi, M., et al. Effects of astaxanthin supplementation on exercise-induced fatigue in mice. Bio. Pharm. Bull. 29(10):2106-2110, 2006.
  • Iwabayashi, et al. Efficacy and safety of eight-week treatment with astaxanthin in individuals screened for increased oxidative stress burden. Journal of Anti-Aging Medicine. 6(4):15-21, 2009.
  • Kajita M, Tsukahara H, Kato M. The effects of a dietary supplement containing astaxanthin on the accommodation function of the eye in middle-aged and older people. Med Consult New Remedies 2009;46:89-93.
  • Karppi, et al. Effects of astaxanthin supplementation on lipid peroxidation. Int J Vitam Nutr. Jan; 77 (1): 3-11, 2007.
  • Malmsten, C. and Lignell, A. Dietary supplementation with astaxanthin rich algal meal improves muscle endurance – a double blind study on male students. Carotenoid Science. 13:20-22, 2008.
  • Matsuyama, et al. A safety study on the long-term consumption of astaxanthin in healthy human volunteer. Japanese Journal of Complementary and Alternative Medicine. (7):43-50, 2010.
  • Miyawaki, et al. Effects of astaxanthin on human blood rheology. Journal of Clinical Therapeutics and Medicines. 21(4):421-429, 2005.
  • Nagaki, Y., et al. Effects of astaxanthin on retinal capillary blood flow in normal volunteers. Journal of Clinical Therapeutics and Medicines. 21(5): 537-542, 2005.
  • Naguib, Y. The antioxidant activities of astaxanthin and related carotenoids. Journal of Agricultural and Food Chemistry. 48(4): 1150-1154, 2000.
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Customer Reviews
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Displaying reviews 1 - 5 of 17

by CorinneC

  • Shop Consultant
excellent product

My husband could not swallow the caplet, so we changed to this product.... All the benefit. Mixes in with his other Isotonix VERY HAPPY

Response from Customer Service:

Dear Valued Customer,

Thank you for taking the time to share your thoughts on the nutraMetrix Isotonix® Astaxanthin! We are so happy to hear you are pleased with the product!

Thank you again!
The Product Information Team

by CarolO

  • Shop Consultant
Good For Eye Health

Astaxanthin is a powerful antioxidant and is recommended for eye health. I will keep taking this.

Response from Customer Service:

Dear Valued Customer,

Thank you for taking the time to share your thoughts on the Isotonix® Astaxanthin! We are happy to hear you are pleased with the product.

Thank you again!
The Product Information Team

by Anonymous

Love Isotonix Astaxanthin

I love Astaxanthin and especially in the Isotonix formulation. I have noted improvements in my skin and in my muscle strength. Feel more powerful when I workout!!

Response from Customer Service:

Dear Valued Customer,

Thank you for taking the time to share your thoughts on the nutraMetrix Isotonix Astaxanthin! We are happy to hear you are pleased with the product.

Thank you again!
The Product Information Team


  • Shop Consultant
Awesome !

This is great for eyes, skin, and so many others

Response from Customer Service:

Dear Valued Customer,

Thank you for taking the time to share your thoughts on the Isotonix® Astaxanthin! We are happy to hear you are pleased with the product.

Thank you again!
The Product Information Team

by DeniB

  • Shop Consultant

My husband and I love taking our Astaxanthin each day, we feel like it gives us that extra layer of protection that we need to accomplish our daily tasks and maintain a healthy body.

Response from Customer Service:

Dear Valued Customer,

Thank you for taking the time to share your thoughts on the Isotonix® Astaxanthin! We are happy to hear you are pleased with the product.

Thank you again!
The Product Information Team