Benefit of Bovine or Marine Collagen Vs. Placebo on Skin, Hair, Nails and Whole Body Health in Healthy Adults

Inclusion Criteria: Females aged 35-55 years. Participants must be comfortable with bovine or marine collagen (non-vegan/vegetarian). Must provide informed consent and be willing to comply with study requirements. Exclusion Criteria: Pregnant or breastfeeding women. History of chronic skin conditions (e.g., eczema, psoriasis) that might interfere with study outcomes. Any active skin infections or severe acne. Currently taking collagen supplements or have taken them within the last 6 months. Use of medications or topical agents that can affect skin, hair, nails, or gastrointestinal health (e.g., corticosteroids, retinoids). Excessive alcohol consumption or current smokers. Regular use of sunbeds. Recent cosmetic procedures (e.g., Botox, fillers, chemical peels, laser treatments) on skin, hair, or nails within the last 3 months. Any condition or situation that, in the opinion of the investigator, may interfere with the participant's ability to comply with the study requirements or give informed consent. Poor adherence to previous study protocols