The Short Answer
Immediate-release caffeine ingredients are designed to dissolve quickly. Sustained-release caffeine ingredients are designed to release caffeine more gradually. The right choice depends on the product concept, the dosage form and the evidence a brand needs for its own claims.
Criteria Formulators Compare
| Criterion | What to Ask a Supplier |
|---|---|
| Release-Profile Evidence | Is the release profile based on laboratory dissolution data, human data, or both? Which method was used? |
| Caffeine Source | Natural (for example, from green coffee beans) or synthetic? Is the source documented? |
| Standardisation | What caffeine content is specified, and by which assay (for example, HPLC)? |
| Dosage-Form Fit | Capsules, tablets, powder blends, sachets? For gummies and drink premixes, has the format been evaluated? |
| Label Declaration | How does the ingredient appear on the label, and what carriers are present? |
| Documentation | Are a specification, CoA and stability data supplied with each enquiry? |
Where CaffXR™ Fits
CaffXR™ is caffeine from green coffee beans (Coffea robusta) on the CITRAP20™ citrus-fibre platform, designed for a gradual release profile in laboratory dissolution testing. Human data is not yet available; ask us for the latest status. See the CaffXR™ Formulation Guide and CaffXR™ Evidence Summary.
Last reviewed: 12 October 2026