Frequently Asked Questions

Below are some good questions we often get. Simply click any question to display the answer.

What is ZanthoSyn?

  • ZanthoSyn is a safe anti-inflammatory for health and longevity.*
  • ZanthoSyn is a pure and highly absorbed form of astaxanthin recommended by healthcare professionals. 
  • ZanthoSyn is an astaxanthin dietary supplement.

What is Astaxanthin?

  • Astaxanthin is a clinically studied ingredient with safe anti-inflammatory activity that supports joint health, heart health, metabolic health, liver health, and healthy aging.*
  • Astaxanthin is a naturally occurring compound found in marine algae, krill, salmon, shrimp, and lobster.
  • Astaxanthin can be sourced naturally by extraction from marine algae, krill, or salmon or manufactured by synthesis in high purity.

Why Do Healthcare Professionals Recommend ZanthoSyn?

  • Healthcare professionals recommend ZanthoSyn because of its manufacturing rigor and excellent absorption. ZanthoSyn is pure astaxanthin that is optimally formulated to be well absorbed into the blood stream.
  • Healthcare professionals find confidence in ZanthoSyn because its synthetic manufacturing provides astaxanthin in the high purity and consistency necessary for dose control and establishment of blood levels, which are critical for managing inflammation and maintaining health.*
  • Healthcare professionals prefer ZanthoSyn because it delivers more astaxanthin to the blood stream than other astaxanthin products. In a human study comparing ZanthoSyn to a leading natural astaxanthin product, the astaxanthin blood levels following administration of ZanthoSyn were nearly 3 times greater than the other astaxanthin product.

Why are Higher Blood Levels of Astaxanthin Good?

  • Astaxanthin is a micronutrient. It is absorbed from foods such as salmon, shrimp and lobster in very small amounts. Research studies in humans and animals suggest that higher blood levels of astaxanthin may provide greater health benefits.

Has Astaxanthin Been Studied for Safety and Efficacy?

  • Astaxanthin has been studied in more than 50 early-stage human clinical studies and hundreds of animal studies.
  • More than than 1,200 peer-reviewed papers have been published related to astaxanthin.
  • If you are a healthcare professional, please contact us for more information.

How Does ZanthoSyn Work?

  • ZanthoSyn contains astaxanthin, which is well known to have safe anti-inflammatory activity for health applications.*
  • After oral ingestion, astaxanthin is transported throughout the body and delivered to cells, where it helps to maintain healthy anti-inflammatory activity by reducing excess oxidative stress at the cellular and mitochondrial level.*
  • We think of astaxanthin as focusing on the source of inflammation™ and safely maintaining its proper function.*

How Does Inflammation Impact Health and Aging?

  • Inflammation increases throughout the body with age. Progressive low level systemic inflammation is hardly noticeable but it is associated with many progressive conditions of aging.
  • The age-related increase in inflammation in particular organs drives the earliest stages of age-related health issues.

Why Do Other Anti-Inflammatories Have Side-Effects?

  • Other anti-inflammatories address late-stage symptoms of inflammation but do little to prevent the inflammatory processes that progressively cause the symptoms.
  • Other anti-inflammatories suppress the body’s natural immune defenses thus causing susceptibility to infection.
  • Astaxanthin acts to maintain healthy levels of inflammation without disabling the immune system and the body’s natural immune responses.*

Is ZanthoSyn Safe?

  • Astaxanthin has been extensively used in animal and human health and has been present in our food chain for thousands of years.
  • The safety of astaxanthin has also been well established through the FDA’s prescribed process for determining the acceptable daily intake of dietary supplements.
  • ZanthoSyn contains astaxanthin, which is Generally Recognized as Safe (GRAS) according to FDA regulations.

How Much ZanthoSyn Can I Take?

  • The suggested serving size is 1 capsule daily with food or as directed by your healthcare professional.

Why Should I Take ZanthoSyn With a Meal?

  • Research shows that astaxanthin, the key ingredient in ZanthoSyn, is best absorbed when consumed with a fatty meal. Suggested meals with healthy fats include avocados, nuts, extra virgin olive oil, fatty fish, cheese, milk, yogurt, coconuts, chia seeds, or eggs.

How is ZanthoSyn Made?

  • ZanthoSyn contains astaxanthin prepared in high purity by natural product total synthesis.
  • ZanthoSyn is made in accordance with current Good Manufacturing Practice (cGMP) regulations for dietary supplements.

What is the Difference Between Synthetic and Natural Astaxanthin?

  • Synthetic astaxanthin is identical to naturally occurring forms of astaxanthin found in marine algae, krill, salmon, shrimp, and lobster.
  • Astaxanthin prepared by synthesis is obtained in high purity whereas natural astaxanthin extracted from marine algae or krill oil is obtained in a complex mixture, which may include many unknown marine byproducts.
  • The precision of synthetic manufacturing also provides healthcare professionals and health-conscious consumers with confidence in the quality and consistency of dosing from every capsule.

Is ZanthoSyn Regulated by the FDA?

  • ZanthoSyn is a dietary supplement and complies with all FDA regulations for manufacturing and labeling.

What are the Ingredients in ZanthoSyn?

  • ZanthoSyn capsules contain astaxanthin finely dispersed in a corn starch-coated matrix of modified food starch and a very small amount of glucose syrup. dl-Alpha-tocopherol (Vitamin E) and sodium ascorbate (Vitamin C) are added as antioxidants. Microcrystalline cellulose, an inert substance that is not absorbed, is also added as a bulking agent to protect capsule integrity, and confers a mottled appearance to the contents.

What are ZanthoSyn Capsules Made Of?

  • ZanthoSyn utilizes vegetarian capsules made from tapioca.

What Do ZanthoSyn Capsules Look Like?

  • ZanthoSyn capsules are clear and contain astaxanthin in the form of a dark powder and microcrystalline cellulose, a white inert powder that is added as a bulking agent to protect capsule integrity, giving the capsules a unique, mottled appearance.

Does ZanthoSyn Have Any Allergens?

  • ZanthoSyn does not contain dairy, eggs, fish, crustacean shellfish, tree nuts, peanuts, gluten, or soy.

Does ZanthoSyn Contain Genetically Modified Organisms (GMOs)?

  • All ingredients in ZanthoSyn are non-GMO.

Is ZanthoSyn Suitable for Vegans?

  • All ingredients in ZanthoSyn are vegan friendly.

Where is ZanthoSyn Sold?

  • ZanthoSyn is sold online at
  • ZanthoSyn is sold at GNC corporate stores across the United States. To find a location near you, please visit the GNC Store Locator.

What Payment Methods are Accepted at

  • We accept all major credit cards including Visa, MasterCard, American Express, Discover, JCB, and Diners Club. We also accept PayPal and Amazon Payments for non-subscription orders.

How are Coupon Codes Applied to Orders?

  • Coupon codes may be applied during the checkout process.
  • Please note: Our pricing structure has changed. Everyone now receives discounted pricing, so standard discount codes no longer apply.

Is ZanthoSyn Available Worldwide?

  • ZanthoSyn is currently only sold in the US.

Why is the Product Named ZanthoSyn?

  • The name ZanthoSyn is derived from “xanthophyll” and “synthetic” because it contains astaxanthin, which is a xanthophyll carotenoid, and it is synthetically manufactured.

What are Xanthophylls?

  • Xanthophylls such as astaxanthin are micronutrients of the carotenoid family. 
  • Xanthophylls are structurally related to carotene and lycopene but possess ideally positioned oxygen atoms that enable optimal alignment in cell membranes and mitochondrial membranes at the source of inflammation.

What is the Symbol that Substitutes for the Letter “o” in the Name ZanthoSyn?

  • The “o” is our contemporary interpretation of an icon used by chemists for generations as the symbol for oxygen in the Lewis Dot Structure. The Lewis series of diagrams show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.
  • The mark signifies the importance of oxygen bonding in the makeup of astaxanthin’s antioxidant capabilities as an anti-inflammatory.
  • Our stylized Lewis symbol will also be seen occasionally as a stand-alone logo for ZanthoSyn.

Question Not Answered Here?

  • Please contact us and we'll be happy to assist you.