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Immune support; Antioxidant support; Respiratory wellness
Adults seeking convenient daily antioxidant and immune support, especially those with limited fruit and vegetable intake or who spend much time indoors.
Take two tablets once daily, preferably with food to support tolerance of vitamin C and zinc.
Gluten Free; Vegetarian; Free from synthetic colours and preservatives; Free from milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soya and sesame.
Ascorbic acid functions as a water-soluble antioxidant and cofactor for enzymes involved in collagen formation and cellular defence mechanisms.
Caution: High intakes may cause digestive discomfort in some people; take with food if sensitive.
Cholecalciferol is converted to calcitriol, which helps regulate immune cell activity and calcium balance.
Caution: High-dose vitamin D may raise calcium levels; avoid combining with other high-dose vitamin D unless advised.
Zinc is a cofactor for many enzymes and supports normal function of immune cells and antioxidant defences.
Caution: Zinc on an empty stomach may cause nausea; long-term high doses may affect copper status.
Selenomethionine supplies selenium for selenoproteins such as glutathione peroxidases that help neutralise reactive oxygen species.
Caution: Do not exceed suggested use, as excessive selenium intake may lead to unwanted effects like brittle hair or nails.
N-acetyl-cysteine provides cysteine to support glutathione synthesis and helps thin mucus by breaking disulphide bonds.
Caution: May cause mild gastrointestinal upset in some people; avoid taking at the same time as activated charcoal, which can reduce absorption.
Vitamin C, selenium and zinc contribute to antioxidant defences, while N-acetyl-cysteine supplies building blocks for glutathione, the body’s key intracellular antioxidant. Vitamin D3 modulates immune cell signalling, complementing the antioxidant-focused nutrients for broad immune support. Beta-carotene–derived vitamin A further supports mucosal barrier integrity and immune cell function.
Who should be cautious: This product contains vitamin D at 5,000 IU per serving, which is above the commonly referenced upper daily level for many adults; those with high blood calcium, kidney concerns, or taking medications affected by vitamin D or calcium balance may need caution. Contains zinc at 30 mg per serving; long-term high intake may affect copper status or cause stomach upset. Contains selenium at 200 mcg per serving; those with thyroid issues or on thyroid medication may need caution. Contains N-acetyl-cysteine; those with peptic ulcers, asthma, or on nitroglycerin may need caution. People who are pregnant, nursing, on prescription medicines, or have ongoing health conditions should discuss suitability with a healthcare provider before use.
Storage: Keep tightly closed in a cool, dry place. Keep out of reach of children.
This product is guaranteed authentic and backed by our easy returns and refunds policy. Details
Vitamin C may enhance antioxidant defenses, supporting overall health and vitality. It works synergistically with other antioxidants to neutralize free radicals, promoting cellular health.
AI generated. Not medical advice.
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Strengthen and nourish your natural immune protection with the power of NaturesPlus® Immune Boost! Uniquely formulated delivering 6 key nutrients to support respiratory and overall immune system health. NaturesPlus Immune Boost provides robust immune support with high-potency vitamins and minerals along with N-Acetyl-Cysteine. These nutrients promote production of the powerful immune-support antioxidant enzyme, Glutathione.*
Can be taken with other NaturesPlus Immune Formulas.
As a dietary supplement, take two tablets each day.
Microcrystalline cellulose, rice protein, plant-based cellulose, stearic acid, silica, pharmaceutical glaze
Free from synthetic: colours, and preservatives. Free from milk,, eggs,, fish, crustacean shellfish, tree nuts, peanuts, wheat,, soya and sesame.
Keep tightly closed in a cool, dry place.
Keep out of reach of children.
While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally be despatched with alternative packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and do not rely solely on the information provided by iHerb. This website has been machine translated as a courtesy to customers. iHerb does not represent or warrant that the translations are complete or error-free and iHerb is not responsible for any translation errors or omissions.
| Supplement information | ||
| Serving size: two tablets | ||
| Servings per container: 30 | ||
| Amount per serving | Reference intake % | |
| Vitamin A (as beta carotene)(3000 IU) | 900 mcg RAE | 100% |
| Vitamin C (as ascorbic acid) | 1000 mg | 1,111% |
| Vitamin D (as cholecalciferol [vegan D3])(5000 IU) | 125 mcg | 625% |
| Zinc (from zinc gluconate) | 30 mg | 273% |
| Selenium (as selenomethionine) | 200 mcg | 364% |
| N-acetyl-cysteine | 600 mg | † |
| †Reference intake not established. | ||
