BUTTER-C
Signature ingredients
Salicylic acid BHA body wash OEM/ODM manufacturing
Salicylic Acid BHA Body Wash · Signature Ingredients · OEM/ODM
Salicylic acid — BHA — is familiar to oily-skin users from facial toners and serums; when the back, chest and shoulders are oily too, many brands want the same active in a body wash. That is a very different problem from a toner: a body wash is lathered and rinsed off within minutes, so only a small share of the salicylic acid stays on the skin, and in a cleansing system pH decides both how much free acid is present (pKa 2.98) and the viscosity, clarity and preservative performance. A body wash falls under the “other products” group of ASEAN Annex III (Ref 98): a maximum of 2.0%, counting every use of salicylic acid including any used as a preservative — unlike the 0.5% that applies to leave-on body lotion. Salicylic acid is not to be used in preparations for children under three, and because body wash usually sits in a shared family bathroom, Butter-C recommends printing that warning on the label. Human data for BHA are mostly leave-on creams and gels on the face; we found no studies of BHA body washes in the sources reviewed, so claims stop at cleansing away excess oil and helping skin look smoother. Butter-C offers full-service OEM/ODM manufacturing, from cleansing system, pH selection and tolerance testing to a labeled finished product with its cosmetic product notification.
Formula base
Salicylic acid in a rinse-off cleansing system
This page differs from the general body wash page in one respect: every choice of base — surfactants, thickeners, preservatives — has to tolerate the acidic pH that salicylic acid needs, and total salicylic acid has to stay below the Annex III ceiling.
Salicylic acid (Salicylic Acid)
A synthetic crystalline material, CAS 69-72-7, molecular weight 138.12. Soluble in water at about 2.24 mg/mL at 25 °C (about 0.22%), readily soluble in alcohol and glycols. A body wash falls under item (b) of Annex III Ref 98, “Other products except body lotion, eye shadow, mascara, eyeliner, lipstick, roll-on deodorant, nail polish”: maximum 2.0% in the ready-for-use product — the same ceiling as the BHA toner page, and four times the 0.5% that applies to body lotion (item c).
A cleansing system that tolerates acidic pH
Sodium Laureth Sulfate, or Decyl Glucoside and Coco-Glucoside, paired with Cocamidopropyl Betaine. The acyl amino acid systems (glycinates, glutamates) used for gentle lines on the general body wash page are sensitive to low pH — they can turn cloudy, precipitate or change viscosity — so they are not the default for a BHA body wash; if a client wants to keep one, pH is set from a pH – clarity – viscosity curve of the actual formula.
Thickening and moisturizing
Hydroxyethylcellulose, Xanthan Gum and salt: HEC is nonionic, needs no neutralization and is little affected by moderate pH changes (CIR). Alkali-swellable thickeners (some Acrylates Copolymer grades used to suspend beads) need a high enough pH to swell, which conflicts with the low pH of an acid product. Glycerin and Panthenol offset the tight feeling after showering.
Preservation, chelation, fragrance
Sodium Benzoate (more effective at acidic pH; rinse-off maximum 2.5% expressed as benzoic acid — Annex VI Ref 1) or Phenoxyethanol (maximum 1%). Disodium EDTA, because salicylate gives a color with iron ions. Fragrance is optional; a fragrance-free version suits users with easily irritated skin.
Key technical points
Four things specific to a body wash named after BHA
A BHA body wash is not a BHA toner poured into a body wash base: contact time, area of use and the people in the household who may use it are all different.
Rinse-off: only a small share stays on the skin
A measurement-method study (author employed by an ingredient supplier, Davies 2015) states in its objective that only about 1–2% of the total salicylic acid dose is deposited on skin during face washing. Trunk skin has a thicker stratum corneum and lower sebaceous gland density than facial skin, and topical products penetrate it less easily (Feng 2026 review, cited in Butter-C’s article on back breakouts). Results from 1.5–2% leave-on facial creams and gels are therefore not transferred to a body wash; any effect on skin feel is measured on the finished product itself.
pH decides the free acid fraction
With a pKa of 2.98, the undissociated fraction of salicylic acid is about 23% at pH 3.5, 9% at pH 4.0, 3% at pH 4.5, 1% at pH 5.0 and 0.3% at pH 5.5 (calculated from the pKa for a dilute aqueous solution, not measured in a surfactant-rich base). At the usual body wash pH of 5–6.5 almost all of it is salicylate. Lowering pH raises the free acid fraction but tests surfactant stability, viscosity and mildness — pH is settled together with tolerance testing, not taken as a default figure.
Adding up under Ref 98
“These levels are inclusive of any use of salicylic acid”: add the free acid, the portion neutralized to salicylate, the portion converted from betaine salicylate (factor 0.541 — a cautious reading, to be confirmed by regulatory affairs) and any used as a preservative (Annex VI Ref 3, maximum 0.5% as acid). A 2-in-1 hair and body wash still uses the 2.0% limit because it is used on the whole body, not the 3.0% for rinse-off hair products (cautious reading).
Young children, large areas, no sprays
Ref 98: “Not to be used in preparations for children under three years of age”; the label sentence “Not to be used for children under three years of age” is mandatory for products that might be used for children under three (footnote 8). A body wash kept in a shared family bathroom can end up in a young child’s hands, so Butter-C recommends always printing it (a cautious recommendation, to be confirmed by regulatory affairs). Salicylate toxicity from skin application is rare but documented (Madan 2014): take care with large areas of damaged skin and when several salicylic acid products are layered. No spray or sprayed-foam formats (applications that may be inhaled are prohibited).
Three formulation directions
Three ways to put BHA in a body wash bottle
Clear BHA shower gel, sulfate – betaine base
Sodium Laureth Sulfate with Cocamidopropyl Betaine, thickened with HEC and salt; rich lather, quick rinse, reasonable cost. Salicylic acid is predissolved in glycol and then partly neutralized; aimed at active people with oily trunk skin in hot, humid climates.
Gentle BHA body wash, glucoside – betaine base
Decyl Glucoside and Coco-Glucoside with Cocamidopropyl Betaine, plenty of humectants, fragrance-free; can state “sulfate-free” as a description of ingredients. Alkyl glucosides are recognized contact allergens, so the full INCI list is shown; mildness is confirmed by tolerance testing on the finished product.
Betaine salicylate body wash
States “contains betaine salicylate”; 1 g corresponds to only about 0.541 g of salicylic acid, and the converted amount is kept in the dossier. A gentle positioning; the “gentle BHA” label currently rests on laboratory data, so “gentler” is written only when the finished product itself has passed tolerance testing.
Packaging must be planned with the formula
Opaque, light-protective plastic pump or flip-top bottles (salicylic acid gradually discolors in sunlight); no sprayers or pressurized foam cans. Plastics, gaskets and pumps are soak-tested with the acid – surfactant solution.
Parameters we monitor
What our R&D lab measures on every sample
Below are the parameters Butter-C tracks during formula development and scale-up. Specific limits are agreed with you on the approved sample and then written into the product’s in-house specification.
- pH
- Measured directly at 25°C on every lot and at each stability checkpoint; pH sets the free acid fraction, viscosity and preservative performance at the same time.
- Salicylic acid content
- HPLC assay at release and at each stability checkpoint; expressed as total salicylic acid (including salt, converted and preservative portions) for comparison with the 2.0% limit.
- Viscosity & clarity
- Rotational viscometer at 25°C; the salicylate formed on neutralization is also an electrolyte and shifts the salt–viscosity curve (formulation experience) — viscosity is adjusted after the BHA level and pH are fixed.
- Low-temperature crystallization
- Held at 4°C and through freeze–thaw cycling; checked for crystals at the bottom and neck of the bottle and in the pump.
- Foaming
- Foam height and stability by a standard method, compared with the approved sample; low pH can change the lather of some systems.
- Stability
- Accelerated aging at 40°C, freeze–thaw cycling and light exposure; watching for discoloration, separation, odor change and pH drift.
- Microbiology & preservative efficacy
- Tested at a GLP / ISO 17025-accredited laboratory; preservative efficacy (challenge) test to ISO 11930 at the finished-product pH — an acidic pH does not replace the test.
- Tolerance & after-shower feel
- Tested on volunteers before pH and salicylic acid level are fixed; stinging and tightness assessed — the basis for CIR’s condition “formulated to be non-irritating and non-sensitizing”.
- Packaging compatibility
- Filled into the actual bottle and pump; watching for pump clogging, gasket discoloration and plastic deformation.
Claims
Writing claims within the cosmetic scope
Buyers of a BHA body wash often have breakouts on the back or chest, or bumps on the upper arms, in mind — conditions a dermatologist needs to tell apart. A 2018 systematic review (14 studies, 671 participants) of washing and cleansers, including salicylic acid cleansers, in people with acne concluded that with so few well-performed studies it is difficult to make reliable recommendations. A cosmetic body wash stops at cleansing, smoothing and describing the suitable skin type.
Cleanses away excess oil and sebum on the back, chest and shoulders
Instead of: claims of an effect on back or chest breakouts, folliculitis.
Helps the skin shed dead cells so it looks smoother
Only when assessed on the finished product itself, since it is rinsed off within minutes. Instead of: peels the skin, skin renewal, clears “chicken skin” bumps (keratosis pilaris is a condition for a dermatologist).
For oily, blemish-prone body skin
Describes who uses it, not an effect on acne. Instead of: prevents acne, clears breakouts in a set number of days.
Contains salicylic acid (BHA)
The amount is stated only when an assay proves it and every source of salicylic acid has been added up. Instead of: a figure above the ceiling when betaine salicylate is added on top, “peel-strength”.
Clean, fresh feel after showering
Only with a sensory test on the finished product. Instead of: acts on skin bacteria, all-day body odor control.
Directions and label warnings
“Not to be used for children under three years of age” (Annex III Ref 98, footnote 8: mandatory for products that might be used for children under three; Butter-C recommends it on every body wash — to be confirmed by regulatory affairs). Avoid the eyes and mucous membranes; do not use on broken or sunburned skin; start a few times a week; do not layer several salicylic acid products; stop if burning persists. Ref 98 has no mandatory sunburn warning (unlike AHAs). Instead of: safe in pregnancy, suitable for the whole family including young children.
Manufacturing specifications
Capabilities
- Texture
- Clear gel or lightly opaque wash; sulfate – betaine or glucoside – betaine base.
- Formats
- Opaque plastic pump or flip-top bottles; no sprayers or pressurized foam cans. Volume agreed when packaging is selected.
- Minimum order quantity
- Agreed per order — depends on the form of BHA, the cleansing system and the chosen format.
- Testing
- Tested at a GLP / ISO 17025-accredited laboratory, including salicylic acid assay; certificate of analysis supplied with every lot.
- Documentation
- Product Information File (PIF) and cosmetic product notification prepared by Butter-C, including the total salicylic acid calculation under Annex III Ref 98 and the under-3s warning on the label.
- Packaging
- Label design, printing and packing run in parallel with formula development.
Suggested product concept
Fragrance-free BHA shower gel for oily back and chest skin
One product direction to help you picture the result — not a ready-made product for sale. The actual formula is built around your brand positioning and price range.
Salicylic acid
The named active; level and pH set by tolerance testing, total salicylic acid not above 2.0% (Annex III Ref 98, item b).
Sodium Laureth Sulfate, Cocamidopropyl Betaine
Rich lather, quick rinse, suited to hot and humid weather; thickened with Hydroxyethylcellulose and salt so viscosity does not depend on pH.
Glycerin, Panthenol
Ease the tight feeling after frequent showering; fragrance-free.
400 ml opaque plastic pump bottle
Light-protective, pump matched to viscosity; label shows “Not to be used for children under three years of age”, eye-area caution and frequency of use.
Customization options
What you can specify
Within the same product type, every brand targets a different customer. Tell us your requirements in the areas below and our pharmacists will build the formula to match.
Form of BHA
Crystalline salicylic acid or betaine salicylate — determines how it is dissolved, how the limit is calculated and the label wording.
Salicylic acid level and pH
Stronger for very oily skin or lighter for first-time users; the two are different level – pH pairs, settled by tolerance testing.
Cleansing system
Sulfate – betaine with rich lather or sulfate-free glucoside – betaine; acyl amino acid systems need separate testing at acidic pH.
Texture and color
Clear gel or lightly opaque wash; any colorant must be listed in Annex IV and stable at acidic pH.
Fragrance
Fragrance-free, or a light citrus or herbal scent; fragrance is also a source of contact allergy, so a fragrance-free version is made in parallel. The ASEAN annexes have no list of fragrance allergens that must be named; for export to the EU, they are named when above 0.01% (rinse-off) under EU rules, based on the fragrance supplier’s composition sheet.
Ingredient preferences
Sulfate-free, paraben-free, vegan — please state these at the outset, as they affect the cleansing and preservative systems at acidic pH.
Further reading
Related knowledge
Salicylic acid (BHA) in cosmetics
Mechanism, evidence, ASEAN Annex III limits and safety notes (in Vietnamese).
Body wash manufacturing
Cleansing system, viscosity, fragrance and packaging of body washes in general, where BHA is just one option.
BHA salicylic acid toner manufacturing
The same 2.0% ceiling but leave-on facial use: its own solvent system, pH and tolerance testing.
Back breakouts and red bumps around hair follicles
Telling them apart, daily care for trunk skin and when to see a dermatologist (in Vietnamese).
Keratosis pilaris (“chicken skin”)
Why cosmetics can only make skin feel softer and smoother without changing the underlying tendency (in Vietnamese).
Betaine salicylate in cosmetics
The 0.541 conversion factor and why “gentle BHA” is still limited evidence (in Vietnamese).
Body scrub manufacturing
A different direction: physical scrub particles or acids in a rinse-off base, used once to a few times a week.
How we work
From idea to finished batch
Eight steps and three milestones signed off by both sides: approved sample, notification number, finished batch. Step-by-step details (in Vietnamese) →
Get started
Tell us about the product you plan to launch
Send us your product direction and expected volume. Our team will get back to you during business hours (Vietnam time, GMT+7).
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