Formulation and Evaluation of Polyherbal Anti-Aging Serum for Skin Revitalization

Background: Skin aging is a natural biological process influenced by intrinsic and extrinsic factors, including oxidative stress, ultraviolet radiation and environmental pollutants. The increasing interest in plant-based cosmetic preparations has encouraged the development of polyherbal formulations containing natural antioxidant and skin-conditioning ingredients. Objective: The present study was undertaken to formulate and evaluate a polyherbal anti-aging serum for skin revitalization using selected herbal ingredients. Methods: Amla (Phyllanthus emblica L.) was collected, shade dried and extracted by maceration using a hydroalcoholic solvent consisting of ethanol and distilled water in a 70:30 (v/v) ratio for 42 hours. The concentrated Amla extract was subjected to organoleptic and preliminary phytochemical evaluation. Four polyherbal anti-aging serum formulations (F1–F4) were prepared using Aloe vera gel, Amla extract, cashew nut oil, clove oil and Vitamin E along with suitable excipients. The concentration of Amla extract was varied from 1–4% and cashew nut oil from 2–5%. The prepared formulations were evaluated for appearance, colour, odour, consistency, homogeneity, pH, specific gravity, relative viscosity, spreadability, washability, skin irritation, preliminary antioxidant activity, microbial quality and physical stability. Results: The concentrated Amla extract showed a percentage yield of 20.54% and exhibited a semisolid, blackish-brown appearance with a characteristic odour and thick, sticky consistency. Preliminary phytochemical screening indicated the presence of alkaloids, flavonoids, tannins, saponins, glycosides, terpenoids and phenolic compounds. All four serum formulations exhibited acceptable physical characteristics, with pH values ranging from 5.12 to 5.88. Specific gravity ranged from 1.013 to 1.024, while relative viscosity ranged from 3.05 to 3.66. Spreadability values ranged from 142.5 to 152.5 g·cm/sec, with F3 showing the highest spreadability. All formulations were easily washable with water. The preliminary skin irritation assessment showed no visible signs of redness, swelling, itching, or burning sensation in the tested formulations (F1-F4). Preliminary iodine-based screening showed colour reduction in all formulations, with F4 exhibiting comparatively greater colour reduction. No visible microbial growth was observed in F1–F4 under the selected test conditions. During the 20-day room-temperature and refrigerated stability study, the formulations maintained their appearance, colour, pH, homogeneity and absence of phase separation. Based on the overall evaluation, F3 was selected as the optimized formulation due to its desirable physicochemical characteristics, highest spreadability and satisfactory physical stability. Conclusion: The developed polyherbal anti-aging serum formulations demonstrated satisfactory physical and physicochemical characteristics, preliminary reducing/antioxidant potential, acceptable microbial quality and preliminary physical stability. The findings support their potential use as natural topical preparations for skin revitalization and anti-aging applications. Further studies involving quantitative antioxidant assays, long-term stability, skin compatibility and clinical evaluation are required to establish their efficacy and safety conclusively.