Do collagen supplements reduce skin ageing?

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1. 1

   Efficacy and safety of hydrolyzed collagen supplementation on skin health outcomes: a systematic literature review of randomized controlled trials.

   European journal of clinical nutrition (Bassila et al.)Published Jun 24, 2026Checked Oct 4, 2026

   “Risk of bias was assessed using Cochrane Risk of Bias v2.0, and results were synthesized descriptively. Twenty-five RCTs (sample sizes ranging from 13 to 236 participants) were included. While most studies were conducted in healthy volunteers, seven studies enrolled patients with chronic disease conditions. HC supplementation demonstrated significant improvements over placebo in key skin parameters: skin hydration (improved in 10 of 15 trials), skin elasticity (10 of 13 trials), and wrinkle depth or volume (9 of 10 trials). Results regarding TEWL were less consistent. HC supplementation was generally well-tolerated, with a low incidence of adverse events. QoL outcomes, assessed in seven studies primarily among osteoarthritis or rheumatoid arthritis patients, showed variable improvements depending on the assessment tool and study population. The majority of included trials were rated as having a high risk of bias. Preliminary evidence suggests that HC supplementation may offer dermatological benefits, but high-quality, standardized, adequately powered, and longer-term RCTs are needed to confirm its efficacy and safety.”

2. 2

   Oral and topical peptides for skin aging: systematic review and meta-analysis of randomized controlled trials.

   Frontiers in medicine (Nukaly et al.)Published Mar 17, 2026Checked Oct 4, 2026

   “Randomized controlled trials (RCTs) assessing peptide effects on skin aging parameters were included. The Cochrane Risk of Bias Tool (RoB 2) assessed study quality. Data were synthesized using a random-effects model in RStudio (R version 4.1.1).ConclusionNineteen RCTs involving 1,341 participants were analyzed. Peptides, particularly oral formulations, significantly improved hydration and brightness, with a modest pooled effect on wrinkle reduction (MD = 0.27, p = 0.04). Subgroup analysis indicated that this benefit was largely driven by oral polypeptides (MD = 1.5, p = 0.01). While effects on elasticity and density were inconsistent, peptides were well tolerated, with minimal adverse events reported across trials. Overall, peptides appear to be safe, non-invasive anti-aging agents, though larger RCTs with standardized outcomes and histopathologic assessment are warranted.Systematic review registrationidentifier CRD420250652779.”

3. 3

   Dietary Collagen Supplementation as a Strategy for Skin Health: A Narrative Review of Clinical Effects on Skin, Hair, Nails, and Wound Healing.

   Nutrients (Biełach-Bazyluk et al.)Published Jul 2, 2026Checked Oct 4, 2026

   “A targeted literature search was conducted using PubMed and Web of Science to identify clinical trials and relevant studies assessing the effects of collagen supplementation on skin aging parameters, including elasticity, wrinkles, hydration, and barrier function, as well as hair loss, nail disorders, and wound healing. Collagen-derived peptide supplementation has been associated with improvements in skin hydration, elasticity, wrinkle appearance, and dermal extracellular matrix organization, while also supporting hair thickness and strength, modestly enhancing nail growth, and promoting wound healing. Benefits are most consistent with low-molecular-weight hydroxyproline-rich peptides, with peptide characteristics appearing more important than collagen source. Evidence is limited by short study durations, heterogeneous designs, multi-ingredient formulations, and industry funding, which reduce confidence in the magnitude and consistency of the reported effects. Nevertheless, high-quality, long-term, independently funded trials with standardized outcomes are still required to confirm these findings.”

4. 4

   Influence of Oral Collagen Peptides on Skin Biophysical Properties in Humans: A Narrative Review.

   Clinical, cosmetic and investigational dermatology (Lei et al.)Published Aug 21, 2026Checked Oct 4, 2026

   “Moreover, altered cutaneous function contributes to the development of extracutaneous disorders. Therefore, great efforts have been made to identify agents and natural ingredients that are safe and effective to improve cutaneous function. In this narrative review, we searched PubMed and Google Scholar for literature on the effects of collagen peptides on skin biophysical properties. Studies have demonstrated that oral peptide improves several cutaneous functions, including stratum corneum hydration, epidermal permeability barrier, elasticity, firmness and roughness, in part via upregulation of keratinocyte differentiation, epidermal lipid synthesis, hyaluronic acid and collagen synthesis, and inhibition of inflammation, in addition to stimulation of fibroblast proliferation and aquaporin 3 expression. However, the heterogeneity among the included studies and their limited sample sizes preclude firm conclusions regarding the benefits of oral collagen peptides for cutaneous biophysical properties. Further research is needed to assess the efficacy of different collagen peptide sources and types across individual skin biophysical outcomes.”

5. 5

   Skin Resilience and Biological Adaptability: Current Clinical Evidence on Micronutrients and Bioactive Compounds.

   Biomedicines (Mihalache et al.)Published Sep 18, 2026Checked Oct 4, 2026

   “Electronic database searches (PubMed/MEDLINE, Scopus, Web of Science) were conducted using predefined terms related to skin aging, resilience-related endpoints, and micronutrient interventions. Controlled human trials were prioritized, and mechanistic findings were distinguished from clinical outcomes. Current clinical evidence most consistently supports a role for carotenoids and antioxidant vitamins in enhancing cutaneous redox stability and short-term photoprotection. Collagen-based formulations and selected polyphenols demonstrate modest improvements in elasticity, hydration, and wrinkle-related parameters, though many trials are limited by small sample sizes, short duration, and heterogeneous endpoints. Overall, micronutrients appear to function primarily as modulators of adaptive capacity rather than as primary drivers of structural rejuvenation. Larger, longer-term randomized trials employing standardized resilience-related endpoints are needed to clarify the magnitude and durability of clinically meaningful effects.”

6. 6

   Impact of Antioxidant-Rich Whole Foods or Supplements on Skin Health: A Systematic Review and Meta-Analysis of Preclinical and Clinical Studies.

   Antioxidants (Basel, Switzerland) (Liang et al.)Published Feb 27, 2026Checked Oct 4, 2026

   “s or supplements on various skin health outcomes by compiling data from five databases, including 94 eligible preclinical and clinical studies.ResultsThe intervention improved overall skin health in preclinical studies, as evidenced by increased skin hydration (Hedges' g = 1.75, 95% CI [1.31; 2.20]) and hyaluronic acid, decreased trans-epidermal water loss (TEWL) (Hedges' g = -2.15, 95% CI [-3.17; -1.13]), epidermal thickness (Hedges' g = -2.59, 95% CI [-3.28; -1.89]), wrinkle formation, and dermatitis scores, alongside changes in inflammatory cytokines and Immunoglobulin E (IgE) levels. As for clinical studies, the intervention increased skin hydration (MD = 2.12, 95% CI [1.02; 3.21]) while decreased TEWL (MD = -0.68, 95% CI [-1.21; -0.16]). Additionally, changes in skin density, epidermal thickness, minimal erythema dose (MED), SCORing Atopic Dermatitis (SCORAD) and the Dermatitis Life Quality Index (DLQI) further support overall improvements for skin health.ConclusionsAntioxidant-rich whole foods or supplements intake improved overall skin health and skin disorder conditions. The magnitude of benefit may vary according to the type of antioxidant and the duration of intervention.”

7. 7

   Assessing the Significance and Awareness of Oral Collagen in Enhancing Health and Beauty Among Consumers in Saudi Arabia: A Cross-Sectional Study.

   Cureus (Goresh et al.)Published Aug 27, 2025Checked Oct 4, 2026

   “Among 171 participants, the majority were women (153, 89.5%) and aged 20-30 years (78, 45.6%). Collagen use was reported by 56 (32.7%), mainly for strengthening hair/nails (42, 75%) and improving skin (40, 71.4%). Reported improvements included hair/nails (13, 23.2%), with 25 (44.6%) experiencing some improvement; skin (13, 23.2%), with 24 (42.9%) experiencing some improvement; joint pain (12, 21.4%), with 22 (39.3%) experiencing some improvement. Powder (45, 80.4%) was the most used form. Users of collagen for 4-8 weeks had significantly greater hair/nail improvement (73.7% versus 26.3%, p=0.033) and lower early discontinuation (16.7% versus 50.0%, p=0.010). Side effects were reported by 32 (57.1%), with gastrointestinal (GIT) symptoms in 18 (32.1%). This study shows that oral collagen use is associated with modest improvements in hair, skin, joint comfort, and sleep, particularly with consistent use over 4-8 weeks. Younger individuals experienced greater benefits. However, side effects and early discontinuation were common. Improved public awareness and further research are recommended to optimize safe and effective use.”