Caffeine

Primary uses

• Water-soluble active with a recognised consumer story
• Sensory and appearance positioning in eye and body formats
• Compatible addition to aqueous bases

Applications

• Eye creams, gels and serums
• Body and contour products
• Scalp and hair leave-ons
• Cleansing and scrub formats

Advantages

• Immediate consumer recognition, which supports the finished-product proposition
• Works in light aqueous formats such as gels, serums and scalp leave-ons
• Available as a well-characterised, widely traded powder

Limitations to consider

• Limited cold-water solubility, and recrystallisation is a common finished-product defect
• Can contribute a slight bitterness in oral-adjacent or lip-area formats
• Any performance claim belongs to the finished brand to substantiate
• Use level is established in your own formulation by bench trial and stability testing. Supplier literature ranges are a starting point for that work, not a specification, and they are not reproduced here as one.
• Colour, odour and sensory behaviour vary between manufacturing sources even where the INCI name is identical, and in personal care those differences are visible to the end consumer. Approve a production-representative sample against your own finished format before the first commercial shipment.

How to choose the right grade

• Define the claim the finished brand intends to make, and confirm who is responsible for substantiating it
• Confirm the pH window and the stability constraints the active imposes on the whole formula
• Establish the addition phase and temperature, since many actives degrade in a hot phase
• Plan finished-product stability testing including colour and odour over the intended shelf life
• Confirm the documentation your quality system requires before the material enters a batch record
• Design the solubilisation route — heat, glycol or a solubiliser — before setting the use level
• Run a cold-storage stability check specifically for crystal formation
• Bench results do not transfer automatically to production. Order of addition, shear, neutralisation and cooling profile all change behaviour at scale, so plan a pilot batch on the intended equipment before committing to a production volume.
• Exact specification is confirmed against supplier documentation at quotation.

Typical grades

• Powder grades traded against declared assay and pharmacopoeial vocabulary
• Grades differentiated by declared particle size
• Buyers search for personal-care, cosmetic and pharmaceutical grade material by name, and those words describe what the buyer needs rather than what is asserted here. Which grade a specific offer corresponds to, and what documentation supports it, is read from the supplier documentation for the exact product quoted.
• Active matter, assay and purity are per-offer values that are declared by the supplier for the exact lot. They change both the use level in the formulation and the true cost per unit of function delivered, so quotations are compared on declared active content rather than on price per kilogram.
• Natural, plant-derived, hypoallergenic, dermatologically tested and similar positioning statements belong to the finished brand and must be supported by the brand owner's own evidence. Any such wording attached to a raw material is treated here as a buyer search term, not as a substantiated property of the material offered.