Gardenia blue is a permitted food colour in several major markets, including the United States under 21 CFR 73.168, and it is the natural blue built for heat. Below are the four things buyers ask us about most often: the two specification limits that decide the grade, the edge of the US permitted list, how it compares with spirulina blue and butterfly pea, and how to read the sheet that ships with every batch.
Specifying gardenia blue: the two limits that decide the grade
Most colour specifications are quoted as a single figure — the colour value, or E-value. For gardenia blue that figure tells you how much pigment is in the drum. It does not tell you whether the material is suitable for a regulated market. Two other numbers do, and they are the first thing to look for on a certificate of analysis.
- Genipin, not more than 5 ppm. Genipin is the molecule that drives the colour-forming reaction. Material still carrying a high free genipin load is material where that reaction was not run to completion, and free genipin is both a stability risk in the finished product and the parameter a regulator checks first.
- Geniposide, not more than 80 ppm. Geniposide is the iridoid glycoside the genipin is derived from, and it should have been consumed in the reaction. A supplier quoting a geniposide ceiling far above 80 ppm is offering an extract rather than a finished colour additive, and the gap shows up in colour strength and in batch-to-batch consistency.
The rest of the sheet — heavy metals by ICP-MS, methanol by GC, identification by TLC — is standard documentation practice. What separates suppliers is whether those figures are reported per batch on a COA that travels with the goods. Our guide to gardenia blue as a colour additive covers the chemistry, the specification and the dosage in more depth.
What the US listing covers — and what it does not
Since 29 August 2025, gardenia (genipin) blue has been a listed colour additive in the United States under 21 CFR 73.168. The listing is permanent and exempt from batch certification, which makes it one of very few natural blues a US formulator can adopt without filing a petition. It is also a narrow listing. Six categories are covered:
- Sport drinks
- Flavoured or enhanced non-carbonated water
- Fruit drinks and ades
- Ready-to-drink teas
- Hard candy
- Soft candy
Outside those categories the additive may not be used to colour a food for which a standard of identity has been issued, unless that standard itself authorises added colour. In practice that leaves carbonated soft drinks, dairy and frozen desserts, baked goods, and jams and condiments outside the current US listing — even though several of them are permitted in other markets and all of them are technically formable with this pigment.
The split matters when you read application work. Our beverage formulation and hard candy and gummy notes sit inside the permitted categories; the baking and frozen dessert notes describe matrices the US listing does not currently cover. Those are process data, not statements of permitted use. If your market is the US and your product falls outside the six categories, the next step is a regulatory assessment rather than a colour trial — our write-up of the FDA listing sets out the permitted list, the specification limits, and the correction the agency had to issue to its own order.
Gardenia blue, spirulina blue or butterfly pea: choosing for the process
Three botanical blues compete for the same brief and they fail in different places. The short version is below; the full side-by-side — chemistry, heat and pH behaviour, permitted lists and specification limits — sits in natural blue pigments for food.
Spirulina blue (phycocyanin, 21 CFR 73.530) carries a broad US listing — confections, frostings, ice cream and frozen desserts, yoghurt, puddings, non-alcoholic beverages, salad dressings and condiments among others — but it is the most fragile of the three. Phycocyanin is heat-sensitive and shifts under acid, so it suits cold-fill, near-neutral systems and struggles wherever a retort, a hot fill or a long ambient shelf life is involved.
Butterfly pea flower extract (21 CFR 73.69) holds the widest US permitted list of the three — carbonated soft drinks, alcoholic beverages, ready-to-eat cereals and snack seasonings all sit inside it. It is an anthocyanin extract, and anthocyanins act as pH indicators: the same powder reads blue near neutral pH and drifts toward purple and pink as acidity rises. That can be a feature or a formulation problem, and it means the finished shade depends on the matrix rather than on the dosage.
Gardenia blue is the one built for heat. It holds its shade through high-temperature processing and across a wider pH band than the other two, which is why it tends to be the default where the process involves boiling, retorting or baking. The trade-off is regulatory: its US permitted list is the narrowest of the three. When we quote a blue we ask two questions first — what the process is, and which market the finished product ships into — because those answers decide the choice more than price does. The guide to natural pigments and our applications overview compare all three across the main food categories.
Regulatory status by market
Gardenia blue is authorised in the United States, Japan and Korea, and in none of them on the same terms. The US listing is recent and confined to six food categories; Japan is the most mature market for it; Korea treats it as a natural additive. Where it cannot be used, it is not listed below.
United States — 21 CFR 73.168
Position
Permanently listed colour additive, exempt from certification, at 21 CFR 73.168, effective 29 August 2025 after the final order of 15 July 2025.
Permitted use
Six categories only: sport and energy drinks, flavoured or enhanced non-carbonated water, fruit juice drinks and ades, ready-to-drink tea, hard candy and soft candy.
Limits
Use outside those six categories is not authorised, so a request for this colour in dairy, bakery or a supplement is a request the listing does not cover.
Japan — 既存添加物 クチナシ青色素
Position
Existing food additive (既存添加物) gardenia blue, クチナシ青色素, in the Japan Existing Food Additives List.
Permitted use
Colourant in foods; label as 着色料(クチナシ) or クチナシ青色素.
Limits
Japan is the most established market for this colour, but the additive still has to meet the Japanese standards and carry the Japanese name on the label.
Korea — 치자청색소
Position
Listed in the Korean Food Additives Code as a natural additive (천연첨가물), gardenia blue.
Permitted use
Colour in foods within the Code’s use standards.
Limits
Use standards apply per food category, and Korean labelling requires the Korean name.
How to read our specification sheet
The table below is the standard grade. Four lines on it carry more information than the rest.
- Loss on drying, ≤7 g/100 g. Moisture is a proxy for how the powder was dried and for how it will behave in a hygroscopic blend. A high figure tends to surface later as caking in a hopper or on a dosing line.
- Colour value, E 1% at 598 nm in distilled water. The wavelength and the solvent are part of the number. An E-value quoted without them cannot be compared across suppliers, so ask for both, and ask that every COA reports on the same basis.
- Carrier, maltodextrin. The pigment is standardised onto a carrier to reach a consistent colour value. If your label is tight on carrier declarations, confirm the carrier before the formulation is locked.
- Mercury, ≤0.1 ppm. This sits well inside the 1 ppm the listing allows. It is the line that attracts the most questions, so it is worth knowing it is a control point rather than a stray figure.
Need the material against a different specification, a different colour value, or carried on something other than maltodextrin? Send the specification and we will quote against it rather than against a catalogue grade. The Ordering, samples and documentation section below covers samples, packaging and the certificates that ship with each batch, and the full range of blue and violet shades sits under natural colours.
Gardenia Blue: The High-Stability Natural Choice for Industrial Food Applications
Product Overview & Biological Source
Gardenia Blue is a high-performance natural pigment derived from the fruit of the Gardenia jasminoides Ellis. Unlike other botanical blues that are extracted directly as a finished color, Gardenia Blue is produced through a sophisticated natural fermentation process. The iridoid glycosides (geniposide) found in the gardenia fruit are enzymatically reacted with amino acids to create a deeply saturated, stable blue hue.
In 2026, as the demand for synthetic-free ingredients reaches an all-time high, Gardenia Blue has bridged the gap between “natural origin” and “industrial durability.” It provides a deep ultramarine to navy blue shade that remains consistent under processing conditions that would typically cause other natural pigments to fail. For manufacturers of baked goods, high-heat confectionery, and complex dairy systems, it offers a reliable, clean-label alternative to FD&C Blue No. 1.
The Science of Superior Stability
What sets Gardenia Blue apart in the world of natural colorants is its remarkable molecular resilience. While protein-based pigments like Phycocyanin are sensitive to environmental stress, the structure of Gardenia Blue is highly robust.
Exceptional Heat Resistance: This pigment can withstand high-temperature processing, including boiling, baking, and UHT sterilization (up to 120°C+), without fading or turning grey.
pH Versatility: Unlike anthocyanin-based colors (like Butterfly Pea) which change color when the acidity shifts, Gardenia Blue maintains a consistent blue shade across a wide pH range (typically from pH 3.0 to 8.0). This makes it ideal for both acidic beverages and neutral dairy products.
Strong Tinctorial Strength: A very small dosage is required to achieve a deep, impactful color, making it an economically efficient choice for large-scale industrial production.
Advanced Fermentation & Purification Process
Our Gardenia Blue is produced using a bio-enzymatic conversion process that mimics natural maturation but under strictly controlled laboratory conditions.
First, we extract high-purity geniposide from premium gardenia fruits. Then, using specific food-grade enzymes and amino acids, we trigger the natural transformation into the blue pigment. This is followed by a rigorous purification phase—utilizing macroporous resin adsorption and membrane ultra-filtration—to remove any residual fruit sugars or bitter components. The final product is a fine, 100% water-soluble powder with excellent clarity and a neutral sensory profile.
Primary Applications in Modern Food Science
Confectionery & Hard Candies: Gardenia Blue is the gold standard for hard-boiled candies and gummies. Its ability to survive high-sugar-boiling temperatures ensures a vibrant blue finish that does not “brown” during the cooling process.
Bakery & Fine Pastry: From blue-velvet cakes to decorative frostings and fillings, this pigment remains stable in the oven’s dry heat, providing a consistent color that survives the entire shelf-life of the baked good.
Beverage Industry (Sports & Functional): For shelf-stable drinks that require long-term storage in transparent packaging, Gardenia Blue offers superior lightfastness compared to other botanical options.
Dairy & Ice Cream: It integrates perfectly into high-fat matrices, providing everything from soft pastels to deep sea-blue tones in yogurts, ice creams, and plant-based desserts.
Nutraceuticals: Used for natural tablet coatings and functional powders, providing a premium visual appeal that signals “health and purity” to the consumer.
Technical Optimization
To ensure the best results when formulating with Gardenia Blue, we recommend the following technical considerations:
Solubility Management: Our powder is highly water-soluble. For oil-based applications, we recommend pre-dispersing the pigment in a small amount of water or glycerin before adding it to the emulsion.
Color Blending: Gardenia Blue is an excellent base for secondary colors. Mix it with Gardenia Yellow to create heat-stable, vibrant greens, or with red beet extracts to achieve deep, rich purples.
Dosage Precision: Due to its high tinctorial strength, we suggest starting with a very low concentration (0.01% – 0.05%) and gradually increasing until the desired shade is reached.
Compliance & Global Regulatory Status
Asia: It has long been an approved food additive in China (GB 2760), Japan, and Korea, where it is a staple in the food industry.
Europe & North America: In 2026, Gardenia Blue is increasingly categorized as a “Natural Botanical Extract” or is used in specific regions where its safety profile has been fully recognized. We provide full documentation, including Heavy Metal Analysis, Pesticide Residue Reports, and Non-GMO certifications, to assist your compliance team.
FAQ
Q1: How does Gardenia Blue differ from Spirulina Blue? The primary difference is stability. Gardenia Blue is heat-stable and acid-stable, whereas Spirulina Blue is sensitive to temperatures above 45°C and low pH. If your process involves baking or boiling, Gardenia Blue is the superior choice.
Q2: Does it have any off-flavors? No. Through our advanced purification process, we eliminate the characteristic bitterness of the gardenia fruit, resulting in a powder that is neutral in taste and odor.
Q3: Is the color consistent between batches? Yes. Every batch of our Gardenia Blue is standardized using spectrophotometric analysis to ensure the Color Value (E-value) is identical, allowing for seamless integration into automated production lines.
Q4: Can I use it in low-pH beverages? Yes. Unlike many other natural blues, Gardenia Blue remains stable and vibrant even in acidic environments (pH 3.0+), making it perfect for carbonated soft drinks and fruit-flavored waters.
For brands that refuse to compromise on stability, Gardenia Blue is the ultimate solution. It combines the clean-label appeal of a plant-based ingredient with the industrial-strength performance required for modern food manufacturing. In the competitive landscape of 2026, it provides the reliability you need to launch successful, vibrant, and natural products.
Ready to enhance your product’s stability? Contact our technical team today for a quote, a Technical Data Sheet (TDS), and a free sample of our premium Gardenia Blue.
Technical Data Sheet
