Natural Factors Natural Factors - C Extra + Quercetin 500/500 mg, 90tabs
Natural Factors C Extra + Quercetin - An immune-support formula that combines the antioxidant benefits of vitamin C with the bioflavonoid quercetin for enhanced support. Vitamin C is not stored by the body and needs to be consumed daily in order to maintain the levels recommended for overall health. Vitamin C is an essential nutrient that helps in collagen formation, which is needed for the normal development and maintenance of bones, cartilage, teeth, and gums. It also helps maintain the body’s ability to metabolize nutrients. Quercetin is a bioflavonoid found in many fruits, vegetables, and herbs. It has a wide range of benefits, including allergy relief, cardiovascular support, and enhancing the body’s absorption and use of vitamin C. Both vitamin C and quercetin also help protect tissues from free radical damage. C Extra + Quercetin contains 500 mg of Vitamin C blended with 500 mg of Quercetin for anyone looking for additional immune and antioxidant support.
Price
Regular Canadian retail price: $38.98 CAD. Price Vault members pay below retail on this product. Member pricing is private and shown after a free opt-in, with no membership fee, no minimum order and no subscription.
In stock. Free shipping across Canada on orders over $89, flat $9.95 under that. 30 days to request a return, with return shipping paid by the customer. Ships from Victoria, BC.
See member pricing on Natural Factors Natural Factors - C Extra + Quercetin 500/500 mg
Why people keep reordering it
- Year-round defense
- Daily support for a resilient immune response.
- Antioxidant support
- Helps protect cells from everyday oxidative stress.
- Tradition meets research
- Time-tested ingredients in clinically informed doses.
Best suited to: wants quercetin at an amount research has used, training hard and wants both together, wants one pill rather than two bottles.
What the research supports
One coated tablet daily gives 500 mg of vitamin C and 500 mg of quercetin. Ninety tablets is a three-month bottle.
Quercetin trials use 500 to 1000 mg a day, usually split in two.
- Collagen formation (evidence: strong, from human deficiency studies, biochemical)
- Vitamin C is the cofactor collagen-building enzymes need to cross-link fibers together. Very low intake is the first thing that shows up in connective tissue.
- Immunity (evidence: moderate, from randomized controlled trial)
- Both actives have their best human data in people under heavy training load. Quercetin trials in that group report fewer days feeling run down.
- Blood flow (evidence: mixed, from randomized controlled trial, meta-analysis)
- Quercetin affects how blood vessels dilate, but trial results disagree and seem to depend on the population and form of quercetin used.
Read the literature: Collagen formation on PubMed, Immunity on PubMed, Blood flow on PubMed.
Is it right for you
Worth it if
- Wants quercetin at an amount research has used
- 500 mg a day reaches the bottom of the studied range, where the 250 mg capsule version does not.
- Training hard and wants both together
- The quercetin trials with the clearest results were run in people under sustained physical load, and vitamin C requirements rise in the same situation.
- Wants one pill rather than two bottles
- Buying quercetin and vitamin C separately at these amounts means two products and two schedules for the same 1000 mg of combined actives.
Look elsewhere if
- Has trouble swallowing large tablets
- 1000 mg of combined actives in one coated tablet makes for a big pill. The 500/250 capsule version is easier to get down, at the cost of half the quercetin.
- Wants to split the dose morning and evening
- The tablet is coated and does not split cleanly. Two 250 mg quercetin capsules taken twelve hours apart matches the trial dosing pattern better.
- Mainly wants a high-dose vitamin C
- You are paying for the quercetin here. A 1000 mg ascorbic acid tablet or a plain vitamin C powder costs far less per gram.
What to expect
Nothing dramatic and nothing quick. The quercetin trials that found measurable differences ran 6 to 12 weeks in people training heavily. Treat this as a background nutrient you take through a season, not something you feel on day three.
How it compares
- Compared with the 500/250 capsule version of the same formula
- Double the quercetin for the same 500 mg of vitamin C, which matters because quercetin is the dose-sensitive half of this pair and vitamin C is already saturating at 500 mg. The tradeoff: It is a coated tablet rather than a vegetarian capsule, so it is a larger pill, slower to break down and awkward to split.
- Compared with a standalone quercetin phytosome
- A phospholipid-bound quercetin absorbs several times better per milligram than the plain aglycone used here. The tradeoff: It costs considerably more, and you lose the 500 mg of vitamin C that comes free in this tablet.
Product details
- Medicinal ingredients
- Vitamin C (ascorbic acid), Quercetin (bioflavonoids)
- Ingredient form
- tabs
- Strength
- 500 mg
- Servings per container
- 90
- Suggested use
- 1 tablet daily with food or as directed by a health care practitioner.
- Country of manufacture
- Canada
- Independent testing
- ISURA
- Certifications
- Non-GMO, Made in Canada
- Storage
- Store in a cool, dry place
- Brand
- Natural Factors
How to take it
1 tablet daily with food or as directed by a health care practitioner.
- Store in a cool, dry place away from direct light.
- Keep out of reach of children.
- Consult a practitioner if you are pregnant, nursing or on medication.
Ingredients
Each tablet contains
- Vitamin C (ascorbic acid)
- 500 mg
- Quercetin (bioflavonoids)
- 500 mg
Non-medicinal ingredients
Microcrystalline cellulose, dibasic calcium phosphate dihydrate, croscarmellose sodium, carbohydrate gum, coating (carbohydrate gum [cellulose], glycerin), stearic acid, vegetable grade magnesium stearate (lubricant), silica.
Free from
Contains no artificial colours, preservatives, or sweeteners; no dairy, starch, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans.
Interactions and cautions
- Medications
- Some immune botanicals may interact with immunosuppressant medication. Review with your practitioner.
- Timing
- Separate from medications by 2 to 4 hours unless directed otherwise by a healthcare practitioner.
- Pregnancy and breastfeeding
- Consult a healthcare practitioner before use if pregnant or breastfeeding.
- General
- Use only as directed. Discontinue and consult a practitioner if you experience an adverse reaction.
This product is not intended to diagnose, treat, cure or prevent disease. Consult a healthcare practitioner before use. Free certified advisors are available at 1-888-386-1211, Mon to Fri, 9am to 5pm PT.
Questions about Natural Factors - C Extra + Quercetin 500/500 mg
- Is this the genuine, authentic product?
- Yes. It is identical to what you would pay full price for anywhere else, sourced through our authorized supplier relationships.
- How is the price below retail?
- We buy direct, with nobody in the middle taking a cut, and we sell it for close to what we paid. You see the price privately because you have unlocked the Vault.
- How fast does it ship?
- Orders placed before 12pm PT are processed the same day and ship within two business days. Shipping is free over $89, and a flat $9.95 under that.
- Can I return it?
- You have 30 days after it arrives to request a return. Product must be unused, in its original packaging, with proof of purchase, and return shipping is paid by you. Find it cheaper anywhere in Canada and we will match the price.