Yellow 5 Lake is an insoluble pigment made by bonding the water-soluble dye Yellow 5 (tartrazine) onto an aluminum hydroxide base. You’ll find it listed on ingredient labels for tablets, candies, cosmetics, and other products where a standard water-soluble dye wouldn’t work well. It produces the same bright yellow color as regular Yellow 5 but behaves differently in manufacturing because it doesn’t dissolve in water.
How a Lake Differs From a Dye
The FDA classifies color additives into three categories: straight colors (dyes), lakes, and mixtures. A straight color like FD&C Yellow No. 5 dissolves in water, which makes it useful for coloring beverages, icings, and other water-based products. A lake is created by chemically reacting that same dye with a precipitant (aluminum cation) and depositing it onto an aluminum hydroxide substrate. The result is a fine, stable powder that won’t bleed or dissolve when it contacts moisture.
This distinction matters for product formulation. Lakes work in environments where water-soluble dyes fail: oil-based foods, chocolate coatings, chewing gum, compressed tablets, and cosmetics that sit on the skin. Because the pigment is locked onto a solid particle rather than floating freely in solution, it resists fading from light and heat better than the dye form. Tablet manufacturers favor lakes for coatings specifically because of this stability.
What It’s Made Of
The manufacturing process starts with a certified batch of FD&C Yellow No. 5, the same tartrazine dye used in liquid food coloring. The dye is dissolved, then chemically reacted with an aluminum salt. This reaction causes the color to precipitate out of solution and attach to particles of alumina (aluminum hydroxide). The finished product is a dry, opaque powder rather than a translucent liquid colorant.
Every batch of Yellow 5 Lake must be independently certified before it can be sold. The formal name follows a standard pattern: the color name, the metal used, and the word “Lake.” So the full designation is FD&C Yellow No. 5 Aluminum Lake. The FDA permits its use in foods, drugs (including those applied near the eyes), and cosmetics under Title 21 of the Code of Federal Regulations.
Where You’ll See It on Labels
If you’re reading this article, you probably spotted “Yellow 5 Lake” on a product you just picked up. The most common places it appears include:
- Medications: Coated tablets and capsules, where the lake gives pills a consistent color without dissolving when swallowed
- Candy and confections: Hard candy shells, chocolate coatings, and gum where water-soluble dyes would bleed or streak
- Cosmetics: Eyeshadows, lipsticks, and face powders, where an insoluble pigment stays put on the skin
- Processed foods: Fat-based or low-moisture products like frosting, snack coatings, and baked goods
Labels sometimes list it as “FD&C Yellow No. 5 Aluminum Lake” or simply “Yellow 5 Lake.” In the European Union, the same base dye is labeled E102.
Safety Limits and Regulation
The Joint FAO/WHO Expert Committee on Food Additives (JECFA) set an acceptable daily intake for tartrazine (the base dye in Yellow 5 Lake) at 0 to 5 milligrams per kilogram of body weight. For a 150-pound adult, that translates to roughly 340 mg per day. Actual exposure levels tend to be far lower. Estimated median intake for children ages 5 to 18 is about 0.22 mg per kilogram of body weight per day, well under the safety threshold.
Both the lake and dye forms of Yellow 5 require batch certification by the FDA before reaching consumers. This means every production run is tested for purity and composition before it can legally be used in products sold in the United States.
Behavioral Effects in Children
The most studied concern around synthetic food dyes, including Yellow 5, involves hyperactivity and attention problems in children. A 2021 review by California’s Office of Environmental Health Hazard Assessment examined 27 clinical trials and found that 64% showed some evidence linking synthetic dyes to behavioral changes. In 52% of those trials, the association was statistically significant.
The effects are modest in size but consistent. A large UK trial testing mixtures of food dyes in 140 three-year-olds and 144 eight-to-nine-year-olds found stronger effects in younger children. A separate meta-analysis of 20 studies estimated a small but real effect on parent-reported behavior, with a larger effect showing up on researcher-administered attention tests. One study found a dose-response pattern: as dye intake increased from 1 mg to 50 mg per day, behavioral scores worsened in a stepwise fashion.
The overall conclusion from this body of research is that synthetic food dyes are associated with inattentiveness, hyperactivity, and restlessness in sensitive children, both those with preexisting behavioral conditions and those without. The effect doesn’t appear in every child, and the size of the effect is small on a population level, but it is reproducible across studies.
Allergic Reactions and Aspirin Sensitivity
A small percentage of people react to tartrazine with allergy-like symptoms. The overall incidence in the general population is low, but it occurs more frequently in people who are also sensitive to aspirin. Reactions can include hives, swelling, and in rare cases bronchial asthma. Because of this cross-reactivity, the FDA previously required a specific warning on products containing Yellow 5 for aspirin-sensitive individuals, noting that it “may cause allergic-type reactions (including bronchial asthma) in certain susceptible persons.”
This sensitivity applies equally to the dye and lake forms, since the active colorant molecule is the same. If you know you react to Yellow 5 in beverages or other water-based products, expect the same reaction from the lake version in tablets or cosmetics.