Best Supplements for Skin
What actually works for glowing, healthier skin from the inside out — collagen, vitamin C, hyaluronic acid, and more. No hype, just evidence.
Your skin is the largest organ in your body, and what you put inside matters as much as what you put on top. A few well-chosen supplements can genuinely improve hydration, elasticity, and that "glow" — especially when paired with sun protection and good nutrition.
This guide is for you if: You want to slow skin aging from the inside, improve hydration and elasticity, address dullness or uneven tone, or complement your topical skincare routine.
See the science behind each pickThe short answer
Collagen peptides (5–10 g/day) plus vitamin C (500–1,000 mg/day) is the core skin stack. Collagen provides the raw material; vitamin C is required to build it. This combination has the strongest evidence for improving skin elasticity and reducing wrinkle depth.
Add omega-3s if your skin is dry or inflamed, and hyaluronic acid (120 mg/day oral) if hydration is your main concern. For brightening and even tone, glutathione (500 mg/day) is popular in India and has emerging evidence.
Top skin supplements, ranked
| Supplement | Dose | Best for | Evidence |
|---|---|---|---|
| Collagen peptides | 5–10 g/day | Elasticity, wrinkles, hydration | Strong |
| Vitamin C | 500–1,000 mg/day | Collagen synthesis, brightening | Strong |
| Omega-3 (EPA/DHA) | 1–2 g/day | Inflammation, dry skin | Strong |
| Hyaluronic acid (oral) | 120–240 mg/day | Deep hydration | Moderate |
| Glutathione | 500 mg/day | Skin brightening, antioxidant | Moderate |
| Astaxanthin | 4–12 mg/day | UV protection, anti-aging | Moderate |
| Biotin | 2,500–5,000 mcg | Nails, skin texture | Weak (unless deficient) |
Collagen peptides (5–10 g in morning coffee or smoothie) + Vitamin C (500 mg with the collagen) + Omega-3 (1 g EPA/DHA with a meal).
This covers the three biggest levers for skin health from the inside. Add HA or glutathione after 4 weeks if you want more.
How to choose based on your skin concern
- Wrinkles and sagging: Collagen peptides + vitamin C — these directly support collagen production in the dermis
- Dry, dehydrated skin: Oral hyaluronic acid + omega-3 — HA holds 1,000x its weight in water; omega-3 strengthens the skin barrier
- Dull, uneven tone: Vitamin C + glutathione — vitamin C inhibits excess melanin; glutathione shifts melanin production toward lighter pheomelanin
- Sun damage and aging: Astaxanthin + vitamin C — astaxanthin is one of the strongest natural antioxidants and offers mild UV protection from the inside
- Acne-prone skin: Zinc (15–30 mg/day) + omega-3 — zinc reduces inflammation and sebum; omega-3 calms inflammatory acne
See how your skin supplements affect your markers
eterni tracks inflammation (hsCRP), vitamin D, omega-3 index, and more — connecting your stack to measurable changes.
Get early accessFrequently Asked Questions
Do collagen supplements actually work for skin?
Yes. Multiple RCTs show that 2.5–10g of hydrolysed collagen peptides daily for 8–12 weeks significantly improves skin elasticity, hydration, and reduces wrinkle depth. The peptides are absorbed, reach the dermis, and stimulate your own collagen production. Look for Type I and III hydrolysed collagen.
Which supplement gives skin glow the fastest?
Vitamin C (500–1000 mg/day) can brighten skin within 2–4 weeks by inhibiting melanin overproduction and supporting collagen synthesis. Glutathione (500 mg/day) is also popular in India for skin brightening, though results typically take 4–8 weeks.
Is oral hyaluronic acid effective for skin?
Yes, though it sounds counterintuitive. Studies show 120–240 mg of oral hyaluronic acid daily improves skin hydration significantly after 4–8 weeks. The mechanism appears to involve stimulating the body's own HA production rather than the oral HA directly reaching the skin.
Can I take collagen and vitamin C together?
Yes — in fact, they work better together. Vitamin C is a required cofactor for collagen synthesis. Taking vitamin C alongside collagen peptides enhances the body's ability to build new collagen. Take them at the same time, ideally on an empty stomach or with a light meal.
The science of skin aging
Your skin ages through two pathways: intrinsic aging (genetics, natural collagen decline — about 1% per year after age 20) and extrinsic aging (UV damage, pollution, poor nutrition). Supplements primarily help with intrinsic aging by providing building blocks your body needs, while sunscreen handles the extrinsic side.
Collagen peptides work because when you ingest hydrolysed collagen, the dipeptides (Pro-Hyp and Hyp-Gly) survive digestion, enter the bloodstream, and accumulate in the skin. There, they signal fibroblasts to produce more collagen and hyaluronic acid. A 2019 meta-analysis of 11 RCTs confirmed significant improvements in skin hydration and elasticity.
Glutathione has gained enormous popularity in India and Southeast Asia for skin brightening. It works by inhibiting tyrosinase (the enzyme that produces melanin) and by shifting melanin synthesis from eumelanin (darker) to pheomelanin (lighter). A 2017 RCT showed significant skin lightening at 500 mg/day over 12 weeks.
Track what's working for your skin — and what's not.
eterni connects your supplement stack to your lab results so you can see real changes, not just marketing claims.
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