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ConsumerLab.com uses JavaScript to provide the best possible experience for our content, but your browser has it disabled. Learn how to enable it here . Recently Added Microplastics in Coffee? August 20, 2026 A recent study measured microplastic particles in i

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Recently Added

Microplastics in Coffee?

August 20, 2026

A recent study measured microplastic particles in instant vs ground coffee. See how much was found in our article about coffee and heart health.

Side Effect with Relaxium Sleep

August 20, 2026

Gastrointestinal side effects are being reported by some users of a popular sleep supplement. Learn more in our article: Relaxium Sleep: Helpful or a Hoax?

Red Yeast Rice Product Change?

August 20, 2026

A CL member whose LDL cholesterol level was maintained for years using our Top Pick red yeast rice supplement reported a recent, unexplained cholesterol increase. Has the product changed? See the Update to the Red Yeast Rice Review.

"Greens" Product No Longer a Top Pick

August 17, 2026

A Top Pick of ours among "greens" supplements is no longer a Top Pick based on a revelation about how it is manufactured. Get the details and see our new Top Pick in our Fruits, Veggies, and Other Greens Supplements Review.

What's Going On With This Dark Chocolate?

August 17, 2026

One of the popular dark chocolates in our recent review has undergone a major change -- despite no change to its name – and we question the accuracy of its nutrition label. Get the details in our Dark Chocolate & Cocoa Review, which includes our Top Picks.

Does urolithin A reduce age-related muscle decline, osteoarthritis, or other age-related diseases?

August 13, 2026

How do urolithin A supplements compare on quality and cost – and is a urolithin A "precursor" a good alternative? Find out in our article about urolithin A.

Shark Air Purifier?

August 10, 2026

See how the Shark NeverChange Air Purifier Max stacks up to other air purifier devices we’ve reviewed. Also see our Top Picks and Runners Up for use in large, medium, and small rooms.

Cadmium in Popular Cacao Powder

August 10, 2026

A popular cacao powder contained high levels of cadmium, a toxic heavy metal, in recent tests. Get the details and see how this compares to other products in our Dark Chocolates & Cocoa Powders Review, which includes our Top Picks among products.

Buying an Air Purifier? Don’t Rely On This Rating

August 06, 2026

Portable air purifier makers sometimes cite EN 1822 ratings when promoting effectiveness. Our air purifier guide explains why that standard can overstate purifier performance and shows you a different rating that is more useful.

Buying Supplements Online? Here's How to Avoid Counterfeits

August 06, 2026

When shopping for supplements online, you can reduce your chance of buying a counterfeit by only buying from authorized sellers. To protect you, we’ve expanded our list of Authorized Sellers for more than 100 brands.

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Q-001What is squid ink?VIEW

Squid ink is a dark secretion that squids eject from their ink sac when they sense danger. Squid ink, upon getting discharged into water bodies, confuses predators while acting as a chemical signal to alert other cephalopods. It is produced in the ink sac and consists of a suspension of melanin granules in a viscous medium, often mixed with mucus from the funnel organ.1,2 Inking mollusks. Three inking cephalopod mollusks (A–C) and one inking gastropod mollusk (D). (A) Humboldt squid, Dosidicus gigas (used with permission from the Monterey Bay Aquarium Research Initiative); (B) Squid with an ink cloud in the background (used with permission from Klaus Stiefel); (C) Octopus escaping and inking (used with permission from Jeffrey N. Jeffords); (D) Sea hare, Aplysia californica (used with permission from Genevieve Anderson). The sea hare’s use of ink as a chemical defense has been well studied and can be used as a model for exploring the cephalopods’ use of ink as a chemical defense.2 Squid ink is a complex biological mixture containing melanin (the dominant pigment), proteins, lipids, polysaccharides, glycosaminoglycans, enzymes, and trace metals such as copper and cadmium.1,2 Squid ink is a high-protein, low-carbohydrate, and low-fat product that contains minerals like calcium, phosphorus, and iron. Reported composition varies widely depending on species, sample preparation, and extraction method, with moisture often exceeding 60-80% and proteins generally representing the major component of the dry matter rather than a fixed nutritional percentage across all squid inks.4,6,7 The protein, carbohydrate, and lipid content of squid ink has been reported differently across studies like Loligo vulgaris and Loligo duvauceli and therefore should be interpreted as study-specific estimates rather than universal values.3,5 Squid ink is a rich source of melanin and bioactive chemical groups like amides, amines, alkenes, aldehydes, nitriles, alkanes, and carboxylic acids. Whereas whole seafood is typically consumed in large portions, squid ink is used in much smaller quantities as a flavoring and coloring agent, thereby limiting its contribution to daily nutrient intake.3,4

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