California Gold Nutrition Defender 4 Review

California Gold Nutrition Defender 4 is a supplement with vitamins and minerals sold as 180 veggie capsules. The product page lists its overview as California Gold Nutrition Defender 4, with Vitamins C and D, Zinc, and Selenium, with immune system support. It is formulated without gluten, GMOs, or soy, is produced in a 3rd party audited cGMP registered (certified) facility, and is suitable for vegetarians. The page states that Defender 4 is formulated with a combination of four clinically-studied vitamins and minerals to help promote a healthy immune system. The product is listed as first available 04/2025, with a shipping weight of 0.43 lb, product code CGN-02546, UPC 898220025466, and package quantity of 180 count. Dimensions are 5.3 x 2.8 x 2.8 in. The suggested use is to take 1 capsule daily, with food, and the page advises use as directed by a qualified healthcare professional. The supplement facts list a serving size of 1 capsule and 180 servings per container. Vitamin C (as Ascorbic Acid) provides 500 mg, 556% Daily Value. Vitamin D (as D3, Cholecalciferol) provides 25 mcg (1,000 IU), 125% DV. Zinc (as Zinc Picolinate) provides 10 mg, 91% DV. Selenium (as L-Selenomethionine) provides 50 mcg, 91% DV. Other ingredients are modified cellulose (hypromellose veggie capsule), microcrystalline cellulose, magnesium stearate, and silicon dioxide (silica). The page states the product is not manufactured with milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soy, sesame, or gluten, and is produced in an FDA-registered, third-party audited, cGMP-compliant facility that may process other products containing these allergens. It is manufactured and quality tested in USA with globally sourced ingredients. Key info lists certifications as halal, gluten-free, and soy-free, and quality standards as GMP. Warnings advise keeping out of reach of children and consulting a healthcare professional if pregnant or lactating, chronically ill, elderly, under 18, taking meds such as meds, or with a diagnosed medical condition. The seal should be intact, and the product should be stored in a cool, dry place away from heat, light, and moisture.

Product Focus: Immune HealthAlso graded for:Blood SugarHealthy AgingThyroid HealthAlso covers:Breathing
Tier ⓘ
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
Biohacker Mentions
Cost per month
$5 at 2 servings
Study, Trial or Testing Result SummaryMembersHuman studies

3 of these 152 human studies gave the ingredient by drip or injection, not by mouth.

Vitamin C at this dose has support. Across 29 trials, colds were common in the general public, but they were about in adults and in children, and about half as common in marathon runners, skiers and soldiers. …

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Review Totals and SummaryMembers205,744 reviews
205,744 reviews · IHerb 188,001 · EBay 17,457 · Vitacost 286

Customers generally have a very view of California Gold Nutrition Defender 4 capsules, which have accumulated about 188287 ratings across various stores. The of feedback, of reviews with stars, rates the product 4 or 5 out of 5, indicating . **What buyers say it did for them** users report that the capsules effectively support their immune system. …

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Biohacker SummaryMembersWhat our biohacker panel says

The panel has single main ingredient for this product, since every ingredient is a smaller ingredient here, so the paragraph covers the four that came up . Vitamin D drew the attention: nearly ten panelists mentioned it, and it or take it themselves. …

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RAL SummaryMembersThe tier and why

The tier rests on a misreading of the vitamin D evidence: 19 of 52 studies and 21 showed , and the largest trials found , so it is a . …

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Immune system, Respiratory system. Combine with and possible side are for members.

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Supplement FactsVitamin C 500 mg · Vitamin D 25 mcg · Zinc 10 mg
Supplement Facts
Serving Size 1 Capsule
Servings Per Container 60
Amount Per Serving% Daily Value
Vitamin C (as Ascorbic Acid)500 mg556%
Vitamin D (as D3, Cholecalciferol)25 mcg125%
Zinc (as Zinc Picolinate)10 mg91%
Selenium (as L-Selenomethionine)50 mcg91%

Other ingredients: Modified Cellulose (Hypromellose Veggie Capsule), Microcrystalline Cellulose, Magnesium Stearate, Silicon Dioxide (Silica). Not manufactured with milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soy, sesame, or gluten. Produced in an FDA-registered, third-party audited, cGMP-compliant facility that may process other products that contain these allergens or ingredients. Manufactured and quality tested in USA with globally sourced ingredients.

Directions: Take 1 capsule daily, with food. Best when taken as directed by a qualified healthcare professional.

Barcode (UPC) 898220025466 · Label source: Vitacost · Report a label change

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Graded October 24, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.