Kirkland Signature Fish Oil 1000 mg Review

Kirkland Signature Omega-3 Fish Oil is presented on this Costco page as an easy and convenient way to help support a healthy heart. The product is sold as 400 softgels under item number 926628. According to the manufacturer, the fish oil supply comes from wild-caught ocean fish rather than farm-raised fish, and state-of-the-art purification processes are used to remove mercury. The page states that mercury is below the limit of 0.1 parts per million. Each serving provides 1000 mg of fish oil, including 250 mg of EPA and DHA omega-3, and the product is labeled as sustainably sourced and United States Pharmacopeia (USP) Verified. The page explains that the Omega-3 fatty acids EPA and DHA help support a healthy heart. It also notes that the American Heart Association recommends that healthy Americans consume two servings of fatty fish per week, providing about 1,750 to 3,500 mg of DHA and EPA, which is equivalent to a daily intake of 250 to 500 mg of the critical omega-3s. Supportive but not conclusive research is cited, stating that consumption of EPA and DHA omega-3 fatty acids may reduce the risk of coronary heart disease. Food sources listed include fatty fish such as salmon, mackerel, anchovies and sardines, while alpha-linolenic acid is described as found in flax, canola, soy, perilla, and walnut oils, with the body converting a low rate of it into EPA and DHA. Suggested use is one softgel taken two times daily with a full glass of water, preferably with a meal. The listed ingredients are fish oil, gelatin (porcine), glycerin, water, and tocopherols. The product contains fish, specifically mackerel, anchovy, menhaden, herring, and sardine. The label states no artificial colors, no artificial flavors, and no yeast or gluten. The specifications list the product as a gluten free softgel for adults in the heart health category. Caution advice asks pregnant or nursing people, or anyone taking medication or planning a medical procedure, to consult a doctor before use. The product should be kept out of reach of children and stored at room temperature, tightly closed, avoiding excessive heat. The USP verification section explains that the mark indicates the product contains the declared ingredients and amounts, does not contain harmful levels of specified contaminants such as heavy metals and pesticides, breaks down within a specified time, and complies with FDA Good Manufacturing Practices. The page also notes the statements have not been evaluated by the Food and Drug Administration and the product is not intended to diagnose, treat, cure, or prevent any disease. Shipping is approximately 3 to 5 business days, and the item ships in plain packaging. A satisfaction guarantee offers a refund if the buyer is not completely satisfied.

Product Focus: CholesterolAlso graded for:Blood PressureAlso covers:Heart
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
$6 at 2 servings
Study, Trial or Testing Result SummaryMembersHuman studies

2 of these 107 human studies gave the ingredient by drip, not by mouth.

For cholesterol, fish oil and its omega-3 fats mainly triglycerides, a type of blood fat, and do little to bad cholesterol. A review of 86 long trials with over 160,000 adults found omega-3 triglycerides by about 15 percent, at higher doses, with little on other blood fats. …

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Review Totals and SummaryMembers5,993 reviews
5,993 reviews · Costco 5,852 · Walmart 141

Kirkland Signature Fish Oil 1000 mg softgels have garnered approximately 5993 ratings across various stores, with of these being 4 or 5 stars. Customer feedback is notably , often split between appreciation for certain aspects and criticism regarding product changes. …

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Biohacker SummaryMembersWhat our biohacker panel says

Panelists take it for heart and brain , inflammation, triglycerides, skin, fertility and sperm , mood and focus, and biological aging. favor fatty fish such as salmon and sardines, and one prefers a triglyceride form for absorption. …

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RAL SummaryMembersThe tier and why
More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Cardiovascular system. Combine with and possible side are for members.

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Supplement FactsFish Oil 1000 mg · Omega-3 Fatty Acids 250 mg · Other Omega-3 Fatty Acids 50 mg
Supplement Facts
Serving Size 1 softgel
Servings Per Container 400
Amount Per Serving% Daily Value
Total Fat1 g1.0%
Cholesterol10 mg3.0%
Fish Oil1,000 mg†
Omega-3 Fatty Acids (EPA+DHA)250 mg†
Other Omega-3 Fatty Acids50 mg†
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value not established.

Other ingredients: Fish Oil, Gelatin (Porcine), Glycerin, Water, Tocopherols.

Directions: Take one (1) softgel two times daily with a full glass of water, preferably with a meal.

Barcode (UPC) 096619926626 · Label source: Costcobusinessdelivery · 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.