| Niacinamide (vitamin B3) | Can help reduce the transfer of melanosomes from melanocytes to surrounding skin cells, supporting a more even-looking complexion. | It can be incorporated into products aimed at uneven tone while also supporting barrier-focused skincare routines. | Used in serums, moisturizers, and layered routines; compatible product concepts can combine it with hydration and barrier-support ingredients. | Performance depends on the finished formula and use pattern. Avoid implying that a cosmetic product changes a person’s natural skin color. |
| Vitamin C and its derivatives | Vitamin C is an antioxidant; some forms can also influence processes involved in melanin formation. | Its antioxidant role makes it relevant to daytime routines designed to address the appearance of dullness and uneven tone. | Derivative selection and encapsulation can support different product formats, including lightweight serums and combination antioxidant products. | Stability varies by form, pH, packaging, and exposure to light and air. Finished-product testing is important for stability and performance claims. |
| Azelaic acid | Has multiple skin-care functions, including effects on tyrosinase activity and use in products for blemish-prone skin. | It can address the appearance of post-blemish marks, linking brightening applications with routines for uneven tone and blemish-prone skin. | Formulation work can improve texture and spreadability in creams, gels, and targeted products used alongside gentle cleansing and sun protection. | Concentration, product classification, and permitted claims vary by market. Tolerability should be assessed for the intended formulation and user group. |
| Alpha-arbutin | Used in cosmetic formulations to help reduce the appearance of dark spots through effects on tyrosinase, an enzyme involved in melanin production. | Its targeted role makes it suitable for spot-focused and tone-evening product concepts. | It can be incorporated into serums and lotions, or combined with complementary ingredients in multi-step routines. | Use levels and product claims should comply with current local regulations. Formula stability and ingredient compatibility require testing. |
| Kojic acid | Can inhibit tyrosinase activity and is used in some products intended to improve the appearance of uneven pigmentation. | It offers formulators another ingredient option for products focused on the appearance of dark spots. | Compatibility testing and protective packaging can help support product development across creams, lotions, and targeted treatments. | Stability and skin tolerance can be formulation-dependent. Regulatory requirements and restrictions differ among markets. |
| Licorice-root constituents | Some licorice-derived compounds, including glabridin, have been studied for effects related to tyrosinase activity and skin soothing. | The combination of tone-care and soothing positioning can suit products designed for routines focused on visible post-irritation marks. | Extract standardization and ingredient selection allow use in creams, serums, and calming products for different skin-care routines. | Extract composition varies with source and processing. Standardization, safety assessment, and evidence for the specific finished product are important. |
| Tranexamic acid | Used in topical skin-care products targeting the appearance of uneven tone; proposed mechanisms are not identical to those of tyrosinase inhibitors. | It broadens brightening formulations beyond ingredients that primarily target melanin-forming enzymes. | It can be developed for targeted serums or incorporated into multi-ingredient tone-care routines, subject to compatibility testing. | Evidence and permitted cosmetic claims vary by product and jurisdiction. Avoid presenting topical cosmetic use as equivalent to medical treatment. |
| Broad-spectrum UV filters | Help protect skin from ultraviolet radiation when used as directed; sun protection can help prevent the worsening of visible pigmentation. | Brightening routines are more complete when paired with daily sun protection, since UV exposure can contribute to uneven pigmentation. | Innovations in texture, finish, and product format can make daily use more convenient, including moisturizers or other products with sun protection. | UV filters are regulated differently across markets. Protection depends on the finished product, adequate application, and reapplication as directed. |