Food Additives Guide | Thickeners, Emulsifiers & Preservatives in OEM Manufacturing

When commissioning OEM manufacturing, the question of "which additives to use" is unavoidable. The choice of additives significantly impacts a product's texture, shelf life, cost, and consumer perception. This article covers the essential knowledge about food additives that OEM clients need to understand.

Food additives in Japan are strictly regulated under Japan's Food Sanitation Act, and an accurate understanding is essential for OEM manufacturing. Japan's food additives are broadly classified into four categories, each with a different legal status and labeling requirements.

Designated Additives (approx. 472 items)

These are additives approved for use by Japan's Minister of Health, Labour and Welfare after evaluating their safety and efficacy. They include sorbic acid, xanthan gum, aspartame, and others — not only chemically synthesized substances but also naturally derived items that have been reclassified as designated additives. Usage standards (target foods and maximum usage levels) are set for each item, and exceeding these limits constitutes a legal violation. For example, potassium sorbate has different upper limits depending on the food type: 3.0 g/kg or less for cheese, 2.0 g/kg or less for meat products.

Existing Additives (approx. 357 items)

These are naturally derived additives that were widely used in Japan before the 1995 revision of Japan's Food Sanitation Act and are listed in the "Existing Additives List." Examples include agar, caramel color, carrageenan, and tannin. Items found to have safety concerns are removed from the list — for instance, madder color was deleted in 2004.

Natural Flavoring Agents (approx. 600 items)

These are flavoring substances obtained from animals or plants, used solely for the purpose of flavoring. Vanilla flavor, lemon oil, and rose oil fall into this category. Because they are used in very small quantities, individual safety evaluations are waived.

Ordinary Foods Used as Additives (approx. 100 items)

These cover cases where substances normally consumed as food are used as additives — for example, using fruit juice for coloring or agar for gelling purposes.

Labeling Requirements and Collective Names

Food additives in Japan must, in principle, be labeled by their substance name, but collective name labeling is permitted for certain functional categories. For example, "yeast food," "gum base," "kansui" (alkaline solution), "acidulant," "seasoning (amino acids, etc.)," "tofu coagulant," "emulsifier," "pH adjuster," and "leavening agent" can be labeled as collective names covering multiple additives. In OEM manufacturing, it is essential to design the final product's labeling during the development stage and confirm with the manufacturer that the additives used comply with Japan's labeling rules.

• Mandatory purpose-name pairing: For 8 functional purposes — sweetener, colorant, preservative, thickener, antioxidant, color fixative, bleaching agent, and anti-mold agent — both the purpose name and substance name must be listed (e.g., "Preservative (Potassium Sorbate)")
• Carry-over: When additives used in the manufacturing process of an ingredient do not exert any effect in the final food product, their labeling may be omitted. However, additives that are allergens cannot be omitted
• Processing aids: Additives used during the manufacturing process that are virtually absent in the final product may be omitted from the label. Examples include filtration aids and extraction solvents

Thickeners, stabilizers, and gelling agents are a group of additives used to impart viscosity, body, and gel strength to foods, enhancing their texture and quality stability. In OEM manufacturing, they are indispensable ingredients for a wide range of products including sauces, dressings, jellies, and beverages. Understanding the characteristics of each type is key to formulation design.

Xanthan Gum

A polysaccharide produced by fermentation of the microorganism Xanthomonas campestris, xanthan gum is the most widely used thickener in the food industry. It provides high viscosity at concentrations of 0.1–0.5% and is extremely stable against temperature and pH changes (pH 2–12). It exhibits strong pseudoplastic (shear-thinning) behavior — thick when scooped with a spoon but thin and light on the palate. When combined with guar gum or locust bean gum, a synergistic effect increases viscosity, and gelation becomes possible. Widely used in dressings, sauces, and suspension stabilization of beverages.

Guar Gum

A polysaccharide extracted from guar bean (Cyamopsis tetragonoloba) seeds. It dissolves in cold water and provides high viscosity at concentrations of 0.3–1.0%. It is less expensive than xanthan gum, making it suitable for products requiring large quantities. However, viscosity loss under heating is greater than xanthan gum, so it may be unsuitable for retort-sterilized products. Used in ice cream to inhibit ice crystal formation and to add viscosity to sauces.

Carrageenan

A sulfated polysaccharide extracted from red seaweeds (Eucheuma, Chondrus, etc.) available in three types: kappa, iota, and lambda. Each type has different gel-forming properties — some produce firm gels (ideal for puddings and jellies), some create elastic gels (ideal for desserts), and others are used only for thickening. The OEM manufacturer selects the optimal type based on the target product texture. Concentration ranges from 0.5–1.5%, and carrageenan has excellent compatibility with milk, making it widely used in puddings, milk jellies, and chocolate milk stabilization.

Agar

A polysaccharide obtained from red algae such as Gelidium and Gracilaria — a gelling agent traditionally used in Japan. At concentrations of 0.5–2.0%, it forms transparent, firm gels with a large difference between melting point (approx. 85°C) and setting point (approx. 35–40°C). Used in traditional Japanese confections like yokan (sweet bean jelly), tokoroten (agar jelly noodles), and fruit jellies. The gel has a somewhat brittle texture without the elasticity of gelatin.

Gelatin

A protein derived from animal bones and skin (hydrolyzed collagen) that gels below 25–30°C — a distinctive feature compared to other gelling agents. It offers excellent melt-in-the-mouth quality, dissolving at body temperature. Concentration ranges from 2–5% and is used in jellies, mousses, and gummy candies. It is a recommended allergen labeling item in Japan, so label design requires attention. Pork-derived and fish-derived options exist — fish-derived gelatin is selected for halal-compliant products.

Pectin

A polysaccharide obtained from citrus fruit peels and apple pomace. HM pectin (high-methoxyl pectin) gels under conditions of sugar content above 55% and pH below 3.5, making it essential for jam and marmalade production. LM pectin (low-methoxyl pectin) gels with calcium ions and is used in low-sugar jams and fruit sauces. Concentration ranges from 0.5–1.5%.

• Xanthan gum + guar gum: Synergistic effect increases viscosity 2–3 times, achieving both cost reduction and texture improvement
• Kappa-carrageenan + locust bean gum: Forms elastic, soft gels (ideal for puddings and desserts)
• Agar + gelatin: Combines the firmness of agar with the elasticity of gelatin, enabling hybrid East-West texture design

Emulsifiers are additives used to uniformly disperse water and oil — which do not naturally mix — to form stable emulsions. They are critical for the texture and quality stability of many processed foods including dressings, mayonnaise, cream, chocolate, and ice cream.

How to Choose an Emulsifier

Each emulsifier has a preferred emulsion type (oil-in-water or water-in-oil). The OEM manufacturer selects the right emulsifier for each product. Simply communicate the target product — dressing, mayonnaise, etc. — and the manufacturer will propose the optimal combination.

Lecithin (Soy Lecithin / Egg Yolk Lecithin)

The most representative natural emulsifier, with an HLB value of approximately 3–4 (suited for W/O type). Soy lecithin is cost-effective and widely used for reducing chocolate viscosity (at 0.3–0.5%), preventing bread staling, and emulsifying margarine. Egg yolk lecithin is essential for mayonnaise emulsification, with phospholipids in the yolk providing powerful emulsifying capability. Soy lecithin requires allergen labeling in Japan as it is derived from soybean (a recommended allergen labeling item).

Glycerol Fatty Acid Esters

The most widely used group of synthetic emulsifiers in the food industry. Produced by esterification of glycerol and fatty acids, they range from monoglycerides (HLB 3–4) to polyglycerol fatty acid esters (HLB 5–16), offering a broad HLB range. Used for bread dough improvement (crumb softening, staling prevention), whipped cream foam stabilization, and ice cream emulsion stabilization. Typical concentration is 0.1–2.0% of the target food.

Sucrose Fatty Acid Esters

Esters of sucrose (sugar) and fatty acids with the notable feature of covering an extremely wide HLB range of 1–16. High-HLB products (HLB 11–16) are used for beverage emulsion stabilization and coffee creamers; low-HLB products (HLB 1–5) are used for chocolate bloom prevention and chewing gum plasticizers. As an emulsifier originating in Japan, Japanese manufacturers possess strong technical expertise.

Polysorbates (Tween Series)

Nonionic surfactants produced by adding ethylene oxide to sorbitan fatty acid esters. Polysorbate 20 (HLB 16.7), Polysorbate 60 (HLB 14.9), and Polysorbate 80 (HLB 15.0) are used in food applications. They exhibit high water solubility and excellent O/W emulsification performance. Used in ice cream, dressings, and beverages, but subject to usage standards — for example, 1.0 g/L or less in ice cream.

• O/W emulsion (oil-in-water): Dressings, beverages, mayonnaise → select emulsifiers with HLB 8–18
• W/O emulsion (water-in-oil): Butter, margarine, chocolate → select emulsifiers with HLB 3–6
• Solubilization: Dispersing oil-soluble components in transparent beverages → requires emulsifiers with HLB 15+

Preservatives and shelf-life extenders are used to inhibit microbial growth in foods, ensuring product safety and extending the quality retention period. In OEM manufacturing, optimal preservation design is required based on the product's distribution format (ambient, chilled, or frozen) and target shelf life.

Preservatives (Japan's Food Sanitation Act requires "Preservative" labeling)

Preservatives are one of the 8 functional purposes that require mandatory purpose-name pairing on labels, e.g., "Preservative (Potassium Sorbate)." Given growing consumer aversion to preservatives, their use requires careful consideration of brand strategy.

Sorbic acid / potassium sorbate is the most representative preservative, with broad antimicrobial spectrum against molds, yeasts, and bacteria. Effective in the pH range of 6.5 or below, it performs best in acidic foods. Usage limits are set per food type: 3.0 g/kg for cheese, 2.0 g/kg for meat products, 0.50 g/kg for pickled vegetables, etc. The water-soluble potassium salt form is more commonly used.

Sodium benzoate is a preservative effective in acidic foods at pH 4.5 or below. Used in carbonated drinks, fruit juices, and soy sauce, it has strict usage standards (0.60 g/kg or less for soft drinks). The shift toward alternatives has accelerated in recent years. The potential for trace benzene formation when co-existing with vitamin C has been noted, requiring attention in formulation design.

Shelf-Life Extenders (antimicrobial ingredients not classified as "preservatives")

Shelf-life extenders do not require labeling as "preservative" — only the substance name is needed — which gives them a significant advantage in consumer acceptance. However, they do not have the same strong antimicrobial potency as preservatives, typically extending shelf life by about 3–5 days.

Epsilon-polylysine is an amino acid polymer produced by the actinomycete Streptomyces albulus, with broad antimicrobial spectrum and heat resistance. Used at approximately 0.01–0.05% in rice products, noodles, and prepared foods. Originating in Japan, it has gained international attention as a natural preservation ingredient.

Glycine is the simplest amino acid, functioning as a shelf-life extender with bacteriostatic properties. It requires relatively large amounts (0.5–2.0%) but also has a sweet taste and flavoring effect. Widely used in rice balls, boxed meals, and bakery products.

Sodium acetate is the sodium salt of acetic acid, possessing both pH-buffering and bacteriostatic properties. Used at approximately 0.1–0.5%, it is particularly noted for its effectiveness against spore-forming bacteria.

Clean Label and Natural Preservation Approaches

A growing consumer trend is the demand for "clean label" — minimizing food additive use and striving for simple, consumer-understandable ingredient lists. This is becoming increasingly important in OEM manufacturing.

• Vinegar: Bacteriostatic effect from acetic acid. Beyond use in sushi rice, pickles, and marinades, micro-addition (0.1–0.3%) to bread and prepared foods provides shelf-life extension without affecting flavor
• Fermented alcohol (ethanol): Utilizes the bacteriostatic effect of ethanol. Used in Japanese sweets, bread, and miso; effective for mold suppression on product surfaces at 1–3%
• Nisin: A bacteriocin (antimicrobial peptide) produced by the lactic acid bacterium Lactococcus lactis, highly effective against gram-positive bacteria. Used in cheese, dressings, and canned foods
• Rosemary extract: Antioxidant and bacteriostatic effects from carnosic acid and carnosol. Used to suppress oxidation in meat products and oil-containing foods

Colorants, sweeteners, and acidulants are indispensable additives for designing a food's appearance, taste, and flavor. In OEM manufacturing, selection must consider both consumer preferences and Japan's regulatory requirements.

Natural Colorants

Driven by consumer preference for natural ingredients, demand for naturally derived colorants continues to grow year by year. However, compared to synthetic colorants, natural colorants have lower stability against light, heat, and pH, requiring careful consideration during product design.

Gardenia pigment is a color group extracted from the fruit of the gardenia plant (Rubiaceae family), available in three color systems — yellow (crocin), blue (geniposide-derived), and red (crocin-geniposide reaction product) — which can be mixed to achieve a wide range of color tones. Widely used in Japanese confections, noodles, pickled vegetables, and beverages. Relatively heat-stable and suitable for retort-processed foods.

Safflower pigment is obtained from safflower petals (Asteraceae family), yielding two colors — yellow (safflor yellow) and red (carthamin). Red carthamin is water-soluble and pH-sensitive, requiring caution when used in acidic foods. Used in jellies, candies, and beverages.

Caramel color is a brown pigment obtained by heat-treating sugars and is the world's most widely used food colorant by volume. Classified into Types I–IV based on manufacturing method; Types III (ammonia caramel) and IV (sulfite ammonia caramel) may be subject to regulation regarding 4-methylimidazole (4-MEI) content. Widely used in soy sauce, sauce, soft drinks, and beer-type beverages.

Sweeteners

Sweeteners are used in products that emphasize low-calorie or low-sugar claims as sugar alternatives, or when sweetness characteristics beyond what sugar alone can achieve are needed.

Stevia is a steviol glycoside extracted from stevia leaves (Asteraceae family), a natural sweetener with 200–300 times the sweetness of sugar. It has a slightly delayed sweetness onset with a lingering aftertaste. Combining with erythritol can adjust the sweetness profile to more closely resemble sugar. Used in beverages, desserts, and diet foods.

Erythritol is a sugar alcohol with approximately 70% the sweetness of sugar and virtually zero calories (0 kcal/g). Absorbed in the small intestine without reaching the large intestine, it is less likely to cause diarrhea compared to other sugar alcohols (xylitol, maltitol). It provides a refreshing sweetness and is often used as a bulking agent in combination with high-intensity sweeteners.

Trehalose is a disaccharide of two glucose molecules with approximately 45% the sweetness of sugar. Rather than as a sweetener, it is valued as a quality preservation agent — preventing starch retrogradation (inhibiting hardening of bread and mochi), suppressing protein denaturation, and improving freeze-thaw stability of frozen foods. Widely used in Japanese confections, bread, and frozen foods.

Acidulants

• Citric acid: The most versatile acidulant, providing a clean, refreshing sourness. Used in beverages, candies, and jams. Also serves as a pH adjuster and provides antioxidant effects through chelation (metal ion sequestration). Typical usage: 0.1–1.0%
• Malic acid: Milder and more sustained sourness compared to citric acid. Used in fruit juice beverages and apple-flavored products. Provides a pronounced refreshing sensation, also suitable for sports drinks
• Lactic acid: Mellow sourness used for pH adjustment. Also contributes to shelf-life extension in pickled vegetables, fermented dairy beverages, and meat products
• Tartaric acid: A grape-derived acidulant used in wine and Western confections. Characterized by its sharp sourness

Food additive selection is a sophisticated process that requires a comprehensive balance of product quality design, regulatory compliance, consumer acceptance, and cost. Here we outline the key points that OEM clients and manufacturers should agree on.

Clean Label Design Philosophy

Recent consumer surveys in Japan indicate that approximately 60–70% of consumers prefer products with fewer food additives. Particularly for BtoC private-brand products, there is growing demand from clients who want to promote "additive-free" or "no artificial additives" claims. However, a 2022 revision to Japan's Food Labeling Standards introduced 10-type guidelines regulating unsubstantiated "additive-free" and "no additives used" claims. In OEM manufacturing, it is important to design for clean labeling while ensuring legally accurate labeling. Specific strategies include strengthening thermal sterilization conditions, pH adjustment, reducing water activity, and switching to chilled distribution — rethinking manufacturing processes and distribution conditions to maintain quality without using additives.

Allergen Risk Management

Some food additives are derived from allergenic raw materials and require careful attention. Examples include soy lecithin (soy-derived), gelatin (cattle/pork/fish-derived), sodium caseinate (milk-derived), and egg white lysozyme (egg-derived). In OEM manufacturing, contamination management for Japan's 8 specified raw materials (shrimp, crab, walnut, wheat, buckwheat, egg, milk, peanut — mandatory labeling) and 20 items equivalent to specified raw materials (recommended labeling) directly impacts production line selection. Verify the manufacturer's allergen management systems — dedicated production lines, cleaning validation, and cross-contamination risk assessment.

Additive Supplier Selection and Quality Standards

The quality of additives used by an OEM manufacturer directly affects final product quality. Key considerations for supplier selection include:

• Compliance with Japan's Food Additive Standards: Are the products used compliant with compositional specifications, purity tests, and general testing methods?
• Lot management and traceability: Can the system trace from additive lot numbers back to raw material origin, manufacturing date, and quality inspection results?
• Stable supply: Are there contingencies for seasonal fluctuations in raw materials and supply chain risks (naturally derived additives are susceptible to weather and disaster impacts)?
• Up-to-date specification sheets and SDS (Safety Data Sheets): Are specification sheets for each additive maintained and current?

Cost Optimization in Formulation Design

Additive costs typically account for 5–15% of product cost, but can exceed 20% in products with extensive functional additive use. Key cost optimization strategies include leveraging synergistic effects to reduce usage (e.g., xanthan gum + guar gum blends), comparing costs of Japan-produced vs. imported ingredients, and utilizing generic products (equivalent items with expired patents). Comparing multiple formulation patterns at the prototyping stage and determining the optimal balance of quality and cost is essential.

Procedures for Additive Changes

When additive changes become necessary after mass production begins (due to supplier changes, cost reduction, regulatory changes, etc.), it is essential to establish clear change management procedures with the OEM manufacturer. Additive changes may require label changes, and packaging revision costs must also be factored in. Conducting quality equivalence verification (sensory evaluation, physical property testing, shelf-life testing) before and after changes, and maintaining records, is fundamental to preventing issues.

Food additive selection is a critical process that influences an OEM product's quality, cost, and consumer acceptance. Organize the following points from the product planning stage onward.

Key Considerations During Product Planning

• How strong is the target consumer's preference for clean labeling? If targeting additive-sensitive consumers, design with a "minimal additives" or "additive-free" premise from the formulation stage
• Distribution format (ambient/chilled/frozen) and target shelf life: The longer the ambient shelf life, the greater the role of preservatives and antioxidants. Clarifying distribution conditions is the starting point for additive design
• Are there allergen-free requirements? Additive-derived allergens such as soy lecithin and gelatin must also be considered
• Balance of cost and quality (natural vs. synthetic): Naturally derived additives tend to be more expensive but can enhance consumer perception

Key Points to Confirm with OEM Manufacturers

• Track record in clean-label formulation (additive-free or minimal additives): Check whether they have experience reducing additives by adjusting processing or distribution conditions
• Additive safety data and regulatory expertise: Knowledge of Japan's usage standards and labeling rules is essential for quality management
• Allergen management systems (contamination prevention): Verify dedicated production lines and cleaning validation practices
• Food label creation support: Confirm capability in handling Japan's complex labeling rules — collective names, purpose-name pairing, carry-over provisions, etc.
• Ability to propose alternative additives (naturally derived, etc.): An ideal manufacturer can suggest transitions such as replacing synthetic preservatives with shelf-life extenders for clean-label compliance

Our platform allows you to search and compare OEM manufacturers that can accommodate clean-label requirements and specific quality standards. Start by reaching out to manufacturers that interest you for a free consultation.