The Best Supplements for Skin, Ranked by What the Research Measured

How we scored

Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:

• Did a trial measure a SKIN outcome, or just a nutrient level? This is weighted heaviest, and it is where most of the aisle fails. Instrumented skin hydration, elasticity, wrinkle depth and inflammatory lesion counts are measurable endpoints that randomized trials can and do report. 'Supports healthy skin' is not an endpoint, it is a structure-function claim that requires no outcome data at all. Hydrolyzed collagen clears this bar across 26 pooled trials; zinc clears it for inflammatory acne lesions; biotin does not clear it in anyone who is not deficient.
• Effect size and duration in plain terms. A statistically significant improvement in instrumented skin hydration is not the same thing as a visible change in the mirror, and the honest framing matters more here than in almost any other category because the before-and-after photo is the industry's primary sales tool. We state what was measured, how long it took — 90 days for the collagen trials — and we say when the honest expectation is 'modest, and you may not notice it.'
• Dose and form that match the research, plus a hard look at the upper limit. Collagen trials cluster around a daily dose of hydrolyzed peptides taken for at least three months; zinc's acne evidence sits well inside the 40 mg adult Tolerable Upper Intake Level, which matters because doses of 50 mg or more for weeks can interfere with copper absorption, reduce immune function and lower HDL cholesterol; vitamin C has a 2,000 mg UL and high doses mostly produce diarrhea and cramping. A product that pushes past a UL to look potent is ranked down, not up.
• Third-party testing and label honesty. Collagen is a protein powder, which means sourcing and heavy-metal testing are real concerns; zinc and vitamin C are commodity minerals and vitamins where the only thing you are buying is accuracy. We weight NSF Certified for Sport, Informed Sport, USP Verified and published certificates of analysis heavily, and we rank proprietary 'beauty blends' last on principle, because a blend that prints one total milligram figure across twelve ingredients has made it impossible to know whether anything in it reached a studied dose.
• Does food or a cream do it better? Often, and we say so. Vitamin C comes from fruit and vegetables and the deficiency this page cares about is rare in the United States. Zinc comes from meat, shellfish and legumes. Protein and the amino acids collagen is made of come from every complete protein you eat, and a bone-broth-rich, high-protein diet is the whole-food version of this page. More to the point, topical retinoids and daily sunscreen have a far larger and better-established effect on photoaging than anything ingestible, and no supplement here competes with either. The products below are for closing gaps and running one honest three-month experiment — not for replacing the basics.

What to know before buying

• Run collagen as a 90-day trial, and judge it on hydration and elasticity rather than on wrinkles. The 2021 International Journal of Dermatology meta-analysis concluded specifically that 90 days of hydrolyzed collagen reduces signs of skin aging, and the hydration and elasticity findings were the ones that held up in the subgroup analysis as well as the pooled one. That tells you two practical things. First, a 30-day tub is not a test — buy the three-month supply or do not bother. Second, set the expectation at skin that feels less dry and has slightly better snap-back, which is what was measured, rather than at a line disappearing. Take a photo in the same light on day one if you want any chance of judging it honestly, because the alternative is retrospective impression and that is worthless in a category this heavily marketed.
• Know who the collagen trials actually studied. The 19-trial meta-analysis covered 1,125 participants aged 20 to 70, and 95% of them were women. That is not a reason for men to skip it, but it is a reason to be straight about where the evidence comes from. The same review is clear that the nutricosmetic literature has grown fast and unevenly: the Nutrients meta-analysis identified several biases in its included trials, and the International Journal of Dermatology published a formal comment criticizing the heterogeneity of the pooled studies. Much of the underlying work is funded by the companies that sell the ingredient. None of that makes the effect fake; all of it makes a modest expectation the correct one.
• The zinc evidence is about acne, not about anti-aging, and the dose ceiling is the thing to watch. The 2020 Dermatologic Therapy review found lower serum zinc in people with acne and a significant improvement in inflammatory papule count with zinc treatment, used alone or alongside something else. That is a specific claim about a specific problem. It is not a claim that zinc smooths wrinkles or brightens anything. If acne is your reason for being on this page, zinc at a sane dose is a cheap, evidence-backed add-on to an actual acne routine — and the adult Tolerable Upper Intake Level is 40 mg a day, with 50 mg or more for weeks able to interfere with copper absorption, reduce immune function and lower HDL cholesterol. The 100 mg bottles in the aisle are not stronger medicine, they are a copper problem.
• Add up the skin nutrients you are already taking before you buy another bottle. This is the quiet failure mode of the beauty aisle: a multivitamin, a collagen powder with added vitamin C, a hair-skin-nails gummy and a standalone biotin capsule can stack to several times any sane intake of the same three or four nutrients. Multivitamins are already taken by roughly one-third of US adults and were the most commonly consumed supplement in the 2017-2018 NHANES data, and NIH notes that people who combine MVMs with other supplements and fortified foods can end up with intakes above the ULs. Read the panel on everything in your cupboard and count the totals, not the bottles. Our guide on taking several supplements at once walks through which pairs genuinely conflict.
• If you take biotin at all, take a small dose — and tell your doctor before any blood work. This is the one item on this page with a concrete, documented risk, and it has nothing to do with the skin. Supplementing biotin beyond recommended intakes can cause clinically significant falsely high or falsely low lab results depending on the test, which can lead to misdiagnosis or inappropriate treatment. Even a single 10 mg dose has interfered with thyroid function tests administered within 24 hours, and in a small study, 10 mg a day for a week produced falsely decreased thyroid stimulating hormone — which could look like thyrotoxicosis — and falsely decreased N-terminal pro-brain natriuretic peptide, which could mean a missed case of congestive heart failure. FDA advises providers to ask patients about biotin-containing supplements and to consider biotin interference when results do not match the clinical picture. The aisle standard is 10,000 mcg, which is more than 300 times the 30 mcg Daily Value. That is the reason our biotin pick here is a 1,000 mcg softgel.
• Spend the money on the basics first, because they outperform this entire page. Daily sunscreen and a topical retinoid have a far better-established effect on photoaging than any oral supplement, and stopping smoking does more than both. Sleep belongs on that list too — it is treated as a performance pillar on the rest of this site for a reason, and chronic short sleep shows up in your face before it shows up anywhere else. Eat the protein, eat the fruit and vegetables, wear the sunscreen, sleep. Then, if you want to run one experiment, run the collagen one for 90 days. And see a dermatologist for persistent acne, a rash that will not settle, or any mole that changes — none of that is a supplement problem.

Our picks

#1Best overall for skinBest overall for skin — the only class on this page with skin-outcome meta-analyses behind it

Vital Proteins — Collagen Peptides Unflavored

Key specs: 20g collagen per 2-scoop serving, grass-fed pasture-raised bovine, unflavored, dissolves easily

$24.99·View on AmazonIn Stock

Pros

• The ingredient class with the strongest evidence here: 26 pooled randomized trials in 1,721 patients found significant improvements in skin hydration (p < 0.00001) and elasticity (p < 0.00001) versus placebo
• A second meta-analysis of 19 randomized, double-blind, controlled trials in 1,125 participants found favorable results for hydration, elasticity and wrinkles, and concluded 90 days is effective
• Unflavored and genuinely soluble, which is the practical requirement for finishing a three-month trial
• Also a 20 g hit of protein per serving, so it is not a dead calorie even if the skin effect underwhelms you

Cons

• The meta-analyses carry real caveats — identified biases in the included trials, a published comment criticizing their heterogeneity, and a literature heavily funded by ingredient manufacturers
• The studied populations were overwhelmingly women (95% of the 1,125 participants in the 19-trial review)
• Collagen is not a complete protein and is a poor choice as your main protein source — treat it as an addition, not a substitute for whey or food
• Among the more expensive collagen powders per serving

Who this one is for

For anyone willing to run one honest 90-day experiment on skin hydration and elasticity. Unflavored and highly soluble matters more than it sounds, because the trials ran for three months and the supplement you actually finish is the one that disappears into coffee. Skip it if you want wrinkle removal — that is not what the trials measured.

Vital Proteins — Collagen Peptides Unflavored

Rubric score

8.4/10

• Skin-outcome evidence9/10
• Dose & duration match9/10
• Testing & transparency8/10
• Value6/10
• Label honesty8/10

$24.99·View on AmazonIn Stock

#2Best value collagenBest value collagen — the same ingredient class at the price that makes 90 days affordable

Great Lakes Wellness — Great Lakes Wellness Collagen Peptides

Key specs: 11g collagen per scoop, grass-fed Brazilian bovine, Kosher certified, unflavored

$32.49·View on AmazonIn Stock

Pros

• Same ingredient the meta-analyses pooled, at a materially lower cost per gram — which is what determines whether a 90-day trial happens
• Bulk-friendly tub sizing, so the three-month commitment is one purchase rather than three
• Clean single-ingredient label with Kosher certification

Cons

• 11 g per scoop means two scoops to reach the dose range most trials used — read the serving, not the tub
• Less third-party testing documentation than the premium brands in this category
• No flavored option if you dislike plain collagen in coffee

Who this one is for

For the person who read the 90-day requirement and did the arithmetic. The trials tested hydrolyzed collagen, not a brand, so the cheapest hydrolyzed collagen you will actually take for three months is the rational purchase. Check the scoop, though: at 11 g per scoop you need two to land where most trials sat.

Great Lakes Wellness — Great Lakes Wellness Collagen Peptides

Rubric score

8.1/10

• Skin-outcome evidence9/10
• Dose & duration match8/10
• Testing & transparency6/10
• Value9/10
• Label honesty8/10

$32.49·View on AmazonIn Stock

#3Best for acne specificallyBest for acne specifically — the one other ingredient here with a meta-analysis on a skin condition

Thorne — Zinc Picolinate 15 mg (60 capsules)

Key specs: 15mg zinc as picolinate, 60 capsules, NSF Certified for Sport, single-ingredient label

$15.00·View on AmazonIn Stock

Pros

• A 2020 systematic review and meta-analysis found people with acne have significantly lower serum zinc than controls, and that zinc treatment significantly improved mean inflammatory papule count as monotherapy or as an adjunct
• The same review found no significant difference in side-effect incidence between zinc and comparators
• 15 mg is a dose that respects the 40 mg adult upper limit, so it is safe to take continuously rather than in bursts
• NSF Certified for Sport — third-party verification on a commodity mineral where accuracy is the only thing you are buying

Cons

• This is acne evidence, not anti-aging evidence — it says nothing about wrinkles, hydration or elasticity
• Zinc on an empty stomach causes nausea in a lot of people; take it with food
• Most expensive per capsule of any zinc here, for a nutrient that costs almost nothing
• Doses of 50 mg or more taken for weeks can interfere with copper absorption, reduce immune function and lower HDL — so do not stack this with a 50 mg bottle

Who this one is for

For anyone whose reason for being on this page is inflammatory acne rather than aging, and who wants an add-on to a real acne routine instead of a replacement for one. 15 mg is deliberately modest: it sits far inside the 40 mg ceiling, which is where you want to be if you are taking it daily for months.

Thorne — Zinc Picolinate 15 mg (60 capsules)

Rubric score

8/10

• Skin-outcome evidence8/10
• Dose & duration match9/10
• Testing & transparency10/10
• Value5/10
• Label honesty9/10

$15.00·View on AmazonIn Stock

#4Best cheap insuranceBest cheap insurance — vitamin C is genuinely required to build collagen, and this costs pennies

Nature Made — Vitamin C 500 mg Tablets (100 count)

Key specs: 500mg vitamin C per tablet, 100 tablets, USP Verified, single-ingredient

$6.99·View on Amazon$7.497% offIn Stock

Pros

• Vitamin C is required for the biosynthesis of collagen — this is physiology, not marketing, and NIH states that a lack of it impairs collagen synthesis and weakens connective tissue
• The deficiency picture is a skin picture: scurvy produces petechiae, ecchymoses, purpura, poor wound healing, hyperkeratosis and corkscrew hairs, and signs can appear within a month of intakes below about 10 mg a day
• USP Verified at a few cents a tablet — the cheapest defensible item on this page
• 500 mg is a sensible single dose, well under the 2,000 mg upper limit

Cons

• Deficiency is rare in the United States, so for most people this is insurance rather than an effect
• No evidence that extra oral vitamin C improves skin in someone who is already replete — topical vitamin C is a separate product with a separate evidence base
• High doses cause diarrhea, nausea and abdominal cramps; more is not better here
• A plain tablet, not a bioflavonoid or buffered formulation, if your stomach is sensitive

Who this one is for

For anyone whose fruit and vegetable intake is thin, or who is taking collagen and wants the cofactor covered. Buy it for the mechanism and the price, not for a promised glow — there is no good evidence that a well-nourished person gets better skin from extra vitamin C.

Nature Made — Vitamin C 500 mg Tablets (100 count)

Rubric score

7.8/10

• Skin-outcome evidence6/10
• Dose & duration match8/10
• Testing & transparency9/10
• Value10/10
• Label honesty9/10

$6.99·View on Amazon$7.497% offIn Stock

#5Best one-bottle optionBest one-bottle option — covers the skin nutrients at sane doses instead of four separate bottles

Thorne — Basic Nutrients 2/Day

Key specs: Two-capsule daily serving, broad-spectrum vitamins and minerals, NSF-certified facility, published COAs

$36.00·View on AmazonIn Stock

Pros

• Solves the stacking problem this category creates: one panel to read instead of four, which is how you avoid ending up over a UL on zinc or biotin without noticing
• Multivitamins are the most commonly consumed supplement in the US — taken in the past 30 days by 24.0% of adults age 20-39 and 29.8% of those 40-59 in the 2017-2018 NHANES data — and this is the version with real testing behind it
• Doses sit at or near recommended intakes rather than the megadoses the beauty aisle favors
• Published certificates of analysis and NSF-certified manufacturing

Cons

• A multivitamin is explicitly insurance, not an effect — no meta-analysis says a multivitamin improves skin
• Two capsules a day, which some people will not keep up
• Premium price for nutrients that are individually cheap
• If your diet is already varied and adequate, this is probably buying you nothing

Who this one is for

For the person who was about to buy a biotin capsule, a zinc capsule, a vitamin C bottle and a hair-skin-nails gummy. A clinical-grade multivitamin covers the same nutrients at doses that respect the upper limits, in one product you can actually read. It is insurance against gaps, not a skin treatment.

Thorne — Basic Nutrients 2/Day

Rubric score

7.2/10

• Skin-outcome evidence4/10
• Dose & duration match9/10
• Testing & transparency10/10
• Value6/10
• Label honesty9/10

$36.00·View on AmazonIn Stock

#6Best biotinBest biotin, if you are going to take biotin — a sane dose rather than a 10,000 mcg megadose

Nature Made — Biotin 1000 mcg (120 softgels)

Key specs: 1,000mcg biotin per softgel, 120 softgels, USP Verified, single-ingredient

$12.28·View on Amazon$14.7917% offIn Stock

Pros

• The most restrained dose in the category — the biotin Daily Value is 30 mcg, so even this is well above requirement
• USP Verified from a mainstream brand, which is the one thing you can actually verify about a biotin capsule
• True biotin deficiency does cause thinning hair, scaly red rash around the eyes, nose and mouth, and brittle nails — so if you are genuinely deficient, correction is real
• Cheap enough that the opportunity cost of being wrong is small

Cons

• NIH's assessment of the hair, skin and nail claims is that they are supported, at best, by only a few case reports and small studies — the nail evidence is three small studies with no placebo group, the hair evidence is case reports in children with a rare hair-shaft disorder, and the skin evidence is case reports in infants
• Documented lab-test interference: supplementing above recommended intakes can cause clinically significant falsely high or low results, and even a single 10 mg dose has skewed thyroid function tests taken within 24 hours
• Biotin deficiency is rare in people eating a normal diet, which makes the correction argument inapplicable to most buyers
• Does nothing measured for skin hydration, elasticity or wrinkles in anyone who is not deficient

Who this one is for

For the reader who has decided on biotin regardless of what the evidence says. If that is you, this is the dose to take: 1,000 mcg from a USP-verified mainstream brand, rather than the 10,000 mcg standard the aisle has settled on for no stated reason. Tell your doctor you take it before any blood work.

Nature Made — Biotin 1000 mcg (120 softgels)

Rubric score

6.4/10

• Skin-outcome evidence3/10
• Dose & duration match8/10
• Testing & transparency9/10
• Value9/10
• Label honesty8/10

$12.28·View on Amazon$14.7917% offIn Stock

#7The category archetypeThe category archetype — included so the comparison is explicit rather than implied

Nature's Bounty — Optimal Solutions Hair, Skin & Nails Formula with 3,000 mcg Biotin (20 servings)

Key specs: 3,000mcg biotin plus vitamin C and E and a collagen-marketed blend, 20 servings per bottle

$8.36·View on AmazonIn Stock

Pros

• Cheap, ubiquitous and genuinely contains vitamin C and E alongside the biotin
• Convenient one-product format for someone who will not take three separate capsules

Cons

• Built around biotin at 3,000 mcg — 100 times the 30 mcg Daily Value — for claims NIH says are supported at best by a few case reports and small studies
• A 20-serving bottle is a 20-day supply, which cannot deliver the 90-day duration the collagen evidence actually requires
• Blend framing makes it impossible to tell whether any single ingredient reached a studied dose
• Carries the same biotin lab-interference problem as a standalone biotin capsule, with less reason to take it
• Lowest score on this page on skin-outcome evidence, which is the criterion that matters most here

Who this one is for

Honestly, nobody who has read this far. It is on the page because it is the product most people reach for when they search for a skin supplement, and the ranking only means something if the default is in it. If you own a bottle, finish it and do not replace it — put the money into collagen for 90 days or into sunscreen.

Nature's Bounty — Optimal Solutions Hair, Skin & Nails Formula with 3,000 mcg Biotin (20 servings)

Rubric score

4.6/10

• Skin-outcome evidence2/10
• Dose & duration match3/10
• Testing & transparency5/10
• Value6/10
• Label honesty3/10

$8.36·View on AmazonIn Stock

Frequently asked questions