Kirkland Signature Vitamin C 1,000 mg Review
The Kirkland Signature Vitamin C 1000 mg. is presented in a highly convenient tablet form, with each substantial container providing 500 tablets, making it a long-lasting supply suitable for adult daily use. This dietary supplement is meticulously formulated to offer comprehensive support for the immune system, a critical aspect of overall health, and to actively promote robust antioxidant activity throughout the body. Antioxidants are vital for combating free radicals and reducing oxidative stress, contributing to cellular health. A core principle guiding the formulation of this product is purity, evident in its complete absence of artificial colors, flavors, and preservatives, addressing common consumer concerns about synthetic additives. Beyond this, the tablets are designed to accommodate a wide range of dietary preferences and restrictions, proudly being certified gluten-free, yeast-free, soy-free, and lactose-free. A paramount feature underscoring the quality and trustworthiness of this Vitamin C supplement is its USP Verified status. This prestigious verification signifies that the product has successfully met the stringent testing, review, and auditing criteria established by the United States Pharmacopeia. The presence of the USP Verified Mark on the label provides multiple layers of assurance to the consumer. Firstly, it confirms that the product indeed contains the ingredients listed on its label, precisely in their declared strength and amounts, eliminating guesswork about potency. Secondly, it guarantees that the supplement does not harbor harmful levels of specified contaminants, such as heavy metals and pesticides, ensuring a clean and safe product. Thirdly, the verification process ensures that the tablets are designed to break down and dissolve efficiently within a specified timeframe, which is crucial for the proper release and subsequent absorption of the dietary ingredients by the body, maximizing their intended benefits. Lastly, it attests to the product's compliance with the FDA's Good Manufacturing Practices (GMP), indicating that it is produced under sanitary and well-controlled processes. This rigorous, multi-faceted verification process is a cornerstone of consumer confidence, reinforcing the promise that "what's on the label is what's in the bottle." The Kirkland Signature brand, renowned for its dedication to delivering exceptional value and consistent quality, positions this Vitamin C supplement as a highly reliable and effective option for individuals committed to maintaining their daily health and wellness, particularly those prioritizing immune system fortification and antioxidant protection without the inclusion of undesirable additives. The generous quantity of 500 tablets per bottle further enhances its appeal, offering a cost-effective and enduring solution for consistent supplementation.
Study, Trial or Testing Result SummaryMembersHuman studies
2 of these 50 human studies gave the ingredient by injection, not by mouth.
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Review Totals and SummaryMembers8,066 reviews
Biohacker SummaryMembersWhat our biohacker panel says
RAL SummaryMembersThe tier and why
More DetailsMembersBody systems · Combine with · Possible side effects
Supplement FactsVitamin C 1000 mg · Citrus Bioflavonoid Complex 100 mg · Hesperidin 10 mg
| Vitamin C | 1,000 mg | 1111% |
| Citrus Bioflavonoid Complex (Citrus spp.) (fruit) | 100 mg | † |
| Hesperidin | 10 mg |
Other ingredients: Ascorbic Acid, Microcrystalline Cellulose (Plant Origin), Maltodextrin, Croscarmellose Sodium, Hydroxypropyl Methylcellulose. Contains < 2% of citrus bioflavonoids, organic guar gum, organic palm oil, rose hips (rosa canina L.) silica, sunflower lecithin, vegetable magnesium stearate, vegetable stearic acid.
Directions: Adults – Take one (1) tablet daily with food as a dietary supplement.
Barcode (UPC) 096619982684 · Label source: Supplementwarehouse · Report a label change
Graded October 23, 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.

