The review brings together human and animal research, but its abstract does not quantify visible skin benefits or identify a proven product.
Systematic review of 176 studies, synthesized narratively rather than statistically pooled.2025
30-second takeaway ＋
The review describes ways carotenoids may influence skin aging, including effects on oxidative damage, inflammation, and the skin’s structural support. It also discusses hydration and elasticity. However, the abstract combines human and animal evidence without separating their results, so it cannot establish how much a dietary or topical carotenoid would improve someone’s skin.
Keep in mind: The studies differed in design and outcomes, preventing pooled analysis. The abstract gives no separate human effect estimates, treatment durations, or detailed bias findings, limiting conclusions about practical skincare benefits.
Study details & source ↗Abstract-based explanation
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A review reported improvements in skin measurements, with uncertainty about study bias and how noticeable the changes were.
Systematic review and meta-analysis of 10 randomized controlled trials.2025
30-second takeaway ＋
The pooled results favored oral collagen for measured skin hydration and elasticity. These findings suggest improvements in those specific measurements, but the abstract does not establish whether people noticed a difference in their skin. It also does not show that any particular dose works better than another.
Keep in mind: This abstract-based explanation cannot resolve unclear study bias or differences between studies. Most trials could not control weather-related factors, and the authors could not assess publication bias.
Study details & source ↗Abstract-based explanation
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Randomized controlled trial · Int J Mol Sci · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Study design not specified in the source record · J Econom · 2025. Source record refreshed; an explanation has not been reviewed.
Study design not specified in the source record2025
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Systematic review · Front Med (Lausanne) · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Randomized controlled trial · J Nutr · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Systematic review · Wound Repair Regen · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Study design not specified in the source record · Cureus · 2025. Source record refreshed; an explanation has not been reviewed.
Study design not specified in the source record2025
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Randomized controlled trial · J Cosmet Dermatol · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Randomized controlled trial · J Med Food · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Randomized controlled trial · Skin Res Technol · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Randomized controlled trial · Int J Mol Sci · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Meta-analysis · J Dermatolog Treat · 2025. Source record refreshed; an explanation has not been reviewed.
Meta-analysis2025
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Meta-analysis · Am J Med · 2025. Source record refreshed; an explanation has not been reviewed.
Meta-analysis2025
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Randomized controlled trial · J Cosmet Dermatol · 2025. Source record refreshed; an explanation has not been reviewed.
Randomized controlled trial2025
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Cohort study (title) · Eur J Surg Oncol · 2025. Source record refreshed; an explanation has not been reviewed.
Cohort study (title)2025
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Systematic review · Exp Dermatol · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Systematic review · Ann Plast Surg · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Systematic review · Lancet Respir Med · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Systematic review · J Cosmet Dermatol · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Systematic review · Enferm Clin (Engl Ed) · 2025. Source record refreshed; an explanation has not been reviewed.
Systematic review2025
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Meta-analysis · Int J Dermatol · 2025. Source record refreshed; an explanation has not been reviewed.
Meta-analysis2025
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Meta-analysis · Nutr Rev · 2025. Source record refreshed; an explanation has not been reviewed.
Meta-analysis2025
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Meta-analysis · Arch Dermatol Res · 2025. Source record refreshed; an explanation has not been reviewed.
Meta-analysis2025
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