Psoriasis Supplements: Evidence-Graded Guide

A 2025 network meta-analysis pooled 21 randomized controlled trials and 1,463 patients to rank supplements for psoriasis by effect size. Vitamin D combined with narrowband UVB produced the largest PASI score reduction (MD -3.29). Curcumin as adjunct therapy nearly quadrupled the odds of reaching PASI 75 (OR 4.31). Probiotics reached statistical significance across two independent 2024 meta-analyses. Fish oil delivered a modest but consistent PASI reduction of -1.58 across 10 studies. Every supplement below is graded by the quality of its human evidence, with dosing, timing, and drug interactions specific to psoriasis medications.

Do Supplements Actually Help Psoriasis?

Psoriasis is a systemic inflammatory disease driven by IL-17, IL-23, and TNF-alpha overproduction. Plaques on the skin are the visible output of immune dysfunction that extends into the joints (psoriatic arthritis affects 30% of patients), the cardiovascular system, and the gut. Supplements do not replace dermatological treatment. They occupy a specific role: correcting nutritional deficiencies that worsen inflammation, and providing adjunctive anti-inflammatory support alongside standard therapy.

The 2025 network meta-analysis (Frontiers in Nutrition, 21 RCTs) established that several supplements produce statistically significant PASI improvements when used as adjuncts. The effect sizes are moderate. No supplement matches the efficacy of biologics like secukinumab or adalimumab. The clinical value lies in stacking small, evidence-based interventions alongside medical treatment.

Two principles guide the recommendations below. First, deficiency correction (vitamin D, selenium, zinc) is a separate category from therapeutic supplementation, and it requires a lower evidence bar because the physiological rationale is direct. Second, all evidence grades are psoriasis-specific. A supplement graded A for another autoimmune condition may earn B or C here if psoriasis trial data is thin.

How We Grade Evidence

Three tiers, based on the quality of human data available for each intervention.

Grade A: Multiple randomized controlled trials or meta-analyses in autoimmune populations. Consistent, reproducible results.

Grade B: At least one RCT, strong case series, or robust mechanistic evidence paired with clinical observations. Promising but not definitive.

Grade C: Preliminary evidence only. Animal studies, in vitro data, or small pilot trials.

For a cross-condition overview of supplement grading, see our best supplements for autoimmune disease guide.

Vitamin D: Grade B (Deficiency) / Grade C (General)

Vitamin D deficiency is disproportionately common in psoriasis patients. A 2013 meta-analysis found significantly lower serum 25(OH)D levels in psoriasis patients compared to healthy controls, with an inverse correlation between vitamin D levels and PASI scores. The vitamin D receptor sits on keratinocytes and on nearly every immune cell relevant to psoriasis pathology: dendritic cells, T cells, and macrophages.

The 2025 network meta-analysis found that vitamin D supplementation combined with narrowband UVB phototherapy produced a PASI mean difference of -3.29. This combination makes mechanistic sense: UVB stimulates cutaneous vitamin D synthesis, and supplementation ensures the substrate is available for that conversion.

Here is where honesty matters. Jenssen et al. published a rigorous RCT in JAMA Dermatology (2023) randomizing 122 psoriasis patients to 20,000 IU/week vitamin D3 or placebo for 12 months. The primary outcome: no significant difference in PASI scores. Patients in this trial were not selected for deficiency.

The reconciliation is straightforward. Correcting a deficiency removes an immunological handicap. Supplementing above sufficient levels does not produce additional benefit. Test your serum 25(OH)D. If you are below 30 ng/mL (common in psoriasis), supplementation is warranted. If you are already at 40 to 60 ng/mL, additional vitamin D is unlikely to improve your plaques.

The VITAL trial (Hahn et al., 2022, BMJ) adds systemic context. In 25,871 adults randomized to 2,000 IU/day vitamin D3 or placebo over 5.3 years, the vitamin D group developed 22% fewer confirmed autoimmune diseases. In years 4 and 5, the reduction reached 39%.

Topical calcipotriol (a vitamin D analogue) is a first-line psoriasis treatment prescribed by dermatologists. Oral vitamin D supplementation and topical calcipotriol work through overlapping but distinct pathways. The topical form delivers high local concentrations to the skin; oral supplementation supports systemic immune regulation.

Dosing: 2,000 to 5,000 IU/day vitamin D3 paired with 100 to 200 mcg vitamin K2 (MK-7 form). K2 directs calcium into bone rather than soft tissue. Test serum 25(OH)D every 3 months until stable. Target: 40 to 60 ng/mL. If you are on calcipotriol, inform your dermatologist about oral vitamin D to avoid hypercalcemia (rare but dose-dependent).

Fish Oil (Omega-3): Grade B/C

The rationale is direct. Psoriatic inflammation depends heavily on arachidonic acid metabolites (leukotrienes, prostaglandins) produced through the COX and LOX pathways. EPA and DHA from fish oil compete with arachidonic acid for the same enzymatic machinery, shifting the balance toward anti-inflammatory resolvins and protectins.

A 2019 meta-analysis in BMC Dermatology pooled 10 studies and 560 psoriasis patients. Fish oil supplementation produced a PASI mean difference of -1.58, reaching statistical significance. The effect was modest. A 2024 umbrella review of eight systematic reviews found the evidence split: four showed benefit, four did not.

Bittiner et al. (1988) conducted one of the earliest RCTs, finding significant improvement in erythema, scaling, and itching with 10 capsules/day of MaxEPA fish oil over 8 weeks. Mayser et al. (1998) compared intravenous omega-3 lipid infusions to omega-6 infusions in hospitalized psoriasis patients and found significant PASI improvement in the omega-3 group. These early studies used high doses and controlled hospital settings.

The inconsistency across trials likely reflects dose variation, EPA-to-DHA ratio differences, and baseline omega-3 status. Studies using high-EPA formulations (EPA:DHA ratio of 2:1 or higher) tend to show better results, consistent with EPA's preferential role in resolving inflammation.

Dosing: 2 to 4 g combined EPA + DHA per day with meals. Choose high-EPA triglyceride-form fish oil (better absorbed than ethyl ester). Doses above 3 g/day have mild anticoagulant properties; discuss with your dermatologist if you take blood thinners or are on methotrexate. For a broader look at diet and psoriasis, see our psoriasis diet and natural treatment guide.

Curcumin: Grade B

Curcumin earns the strongest therapeutic grade among psoriasis supplements, based on a 2022 systematic review published in Frontiers in Pharmacology. As an adjunct to standard treatment, curcumin produced an odds ratio of 3.94 for reaching PASI 50 and 4.31 for PASI 75. These numbers mean patients taking curcumin alongside their prescribed therapy were roughly four times more likely to achieve a 75% plaque clearance than those on treatment alone.

The mechanism centers on NF-kB inhibition. Psoriasis is an NF-kB-driven disease: this transcription factor controls the expression of TNF-alpha, IL-17, and IL-22, the cytokines that sustain keratinocyte hyperproliferation and immune cell infiltration. Curcumin suppresses NF-kB activation, reduces IL-22 production (a cytokine particularly central to plaque formation), and downregulates Th17 differentiation.

Biologics like secukinumab (anti-IL-17A) and adalimumab (anti-TNF) target the same inflammatory cascade through different entry points. No adverse interaction between curcumin and biologics has been documented in the literature. The theoretical concern of additive immunosuppression exists but has not materialized clinically.

Bioavailability remains the practical challenge. Standard turmeric powder delivers roughly 3% curcumin, and curcumin itself is poorly absorbed, rapidly metabolized, and quickly eliminated. Clinical trials use enhanced formulations: BCM-95 (curcumin with essential oils of turmeric), Meriva (phytosomal curcumin), or curcumin with piperine (which increases absorption approximately 2,000%). Cooking with turmeric is not therapeutic supplementation.

Dosing: 1,000 mg/day BCM-95 or equivalent bioavailable curcumin, split into two doses with meals. Curcumin has mild anticoagulant and CYP3A4-modulating properties. Discuss with your dermatologist if you take cyclosporine (CYP3A4 substrate) or blood thinners.

Probiotics: Grade B (Emerging)

The gut-skin axis connects intestinal dysbiosis to psoriatic inflammation through shared immune pathways. Psoriasis patients show reduced gut microbial diversity, decreased Faecalibacterium prausnitzii (a key butyrate producer), and increased intestinal permeability compared to healthy controls. Disrupted gut barrier function allows microbial antigens into systemic circulation, activating dendritic cells and amplifying Th17 responses in the skin.

Two independent 2024 meta-analyses confirm that probiotics improve psoriasis outcomes. Zhu et al. (Frontiers in Medicine, 7 RCTs, 400 patients) found a PASI mean difference of -3.09 favoring probiotics over placebo. Wei et al. (Journal of Cosmetic Dermatology, 5 RCTs, 286 patients) reached the same conclusion: probiotics were superior to placebo for PASI reduction.

The strains tested across trials were predominantly multi-strain Lactobacillus and Bifidobacterium combinations. L. rhamnosus appears in several positive trials. The minimum effective treatment duration was 12 weeks, consistent with the time required for measurable shifts in gut microbial composition.

A note on expectations: the PASI reduction from probiotics (-3.09) is comparable to vitamin D with phototherapy (-3.29) and larger than fish oil (-1.58). These are adjunctive effect sizes, not standalone treatments. Probiotics will not clear moderate-to-severe plaques. They may improve outcomes when stacked with medical treatment and dietary changes.

Dosing: Multi-strain probiotic containing Lactobacillus and Bifidobacterium species, minimum 10 billion CFU/day. Continue for at least 12 weeks before assessing benefit. Take on an empty stomach (bedtime or 30 minutes before breakfast). If you are on immunosuppressive therapy (methotrexate, cyclosporine, biologics), discuss probiotic use with your dermatologist first.

Selenium: Grade C

Selenium functions as a cofactor for glutathione peroxidase, the enzyme system responsible for neutralizing reactive oxygen species in skin and immune cells. Psoriatic skin shows elevated oxidative stress markers, and some studies report lower serum selenium levels in psoriasis patients versus matched controls.

The 2025 network meta-analysis did not rank selenium among the top-performing supplements for PASI improvement. The evidence remains preliminary. Selenium may benefit patients who are genuinely deficient (serum selenium below 70 mcg/L), particularly in regions with selenium-poor soil (parts of Europe, China, and New Zealand).

Dosing: 100 to 200 mcg/day selenium (selenomethionine form). Test serum levels before supplementing. Selenium has a narrow therapeutic window; doses above 400 mcg/day cause selenosis (hair loss, nail brittleness, GI distress). For more on selenium's role in autoimmunity, see our selenium for Hashimoto's article, which covers the mechanism in depth.

Other Supplements Worth Knowing

Zinc (Grade C)

Serum zinc levels are consistently lower in psoriasis patients compared to healthy controls. Zinc supports keratinocyte differentiation, wound healing, and immune regulation. It inhibits NF-kB activation through A20 protein induction. Direct RCT evidence for oral zinc in psoriasis is limited, but the deficiency data and mechanistic rationale justify testing and correcting low levels.

Dosing: 15 to 30 mg elemental zinc per day (zinc picolinate or zinc bisglycinate for better absorption). Doses above 40 mg/day for extended periods can deplete copper; monitor if supplementing long term.

Milk Thistle / Silymarin (Grade C)

Milk thistle earns its place specifically for psoriasis patients on methotrexate. Methotrexate is hepatotoxic, and patients on long-term therapy require liver enzyme monitoring. Silymarin (the active compound in milk thistle) has documented hepatoprotective properties: it stabilizes hepatocyte membranes, increases glutathione synthesis, and scavenges free radicals in liver tissue.

Silymarin also inhibits NF-kB, providing a theoretical anti-inflammatory benefit beyond liver protection. No psoriasis-specific RCT exists for milk thistle. The hepatoprotective evidence comes from trials in alcoholic liver disease and hepatitis C.

Dosing: 150 to 300 mg silymarin per day. Discuss with your dermatologist if you are on methotrexate. Do not use milk thistle as a substitute for regular liver function monitoring.

Vitamin B12 (Topical, Grade C)

Topical vitamin B12 cream applied directly to psoriatic plaques showed promising results in a small 2009 study, with improvement in erythema and plaque area. The mechanism involves B12's scavenging of nitric oxide (elevated in psoriatic skin). Oral B12 supplementation has no established benefit for psoriasis unless a systemic deficiency exists.

Supplements to Avoid with Psoriasis

Immune-stimulating supplements. Echinacea, elderberry, spirulina, chlorella, ashwagandha, and astragalus all upregulate immune cell activation. Psoriasis is driven by overactive Th17 and Th1 immune responses. Stimulating the immune system worsens the disease. Check ingredient labels on multivitamins, greens powders, and "immune support" blends for hidden immune stimulants.

High-dose biotin. Biotin above 5,000 mcg/day interferes with laboratory immunoassays, producing falsely abnormal thyroid function tests, vitamin D readings, and inflammatory markers. This creates diagnostic confusion, not therapeutic benefit. Standard doses (30 to 100 mcg) in multivitamins are fine.

Supplemental vitamin A (if on acitretin). Acitretin is a retinoid. Adding supplemental vitamin A creates additive toxicity risk: liver damage, hyperlipidemia, and teratogenicity. Dietary vitamin A from food is acceptable. Supplemental retinol or beta-carotene in capsule form is not, while on acitretin.

St. John's wort (if on cyclosporine). St. John's wort induces CYP3A4 and P-glycoprotein, reducing cyclosporine blood levels by 40 to 60%. This is one of the most dangerous supplement-drug interactions in dermatology. The interaction is well documented and absolute.

For a comprehensive list of supplements to avoid across autoimmune conditions, see our best supplements for autoimmune disease guide.

Drug-Supplement Interactions

Psoriasis medications span multiple drug classes, each with distinct supplement interaction profiles. The table above summarizes the key interactions. Below are the details.

Methotrexate

Methotrexate remains the most commonly prescribed systemic therapy for moderate-to-severe psoriasis. Folate supplementation (1 mg/day folic acid) is medically required to reduce side effects: nausea, mouth ulcers, and hepatotoxicity. Take folate on a different day than methotrexate to preserve the drug's efficacy.

Fish oil above 3 g/day has mild antiplatelet effects. Monitor for easy bruising if combining with methotrexate (which also affects platelet function). Milk thistle may provide hepatoprotective support but should be discussed with your prescribing physician.

Biologics (Secukinumab, Adalimumab, Ustekinumab, Guselkumab)

Biologics target specific cytokines (IL-17A, TNF-alpha, IL-12/23, IL-23). Vitamin D supplementation is compatible and may support biologic response through shared immune modulation. Curcumin modulates NF-kB upstream of the pathways biologics target; no adverse interaction has been documented.

The critical rule: avoid immune-stimulating supplements. Biologics suppress specific immune pathways. Echinacea, elderberry, and similar supplements stimulate nonspecific immune activation, working against the intended mechanism.

Apremilast (Otezla)

Apremilast inhibits phosphodiesterase 4, reducing multiple inflammatory cytokines. No major supplement interactions are documented. GI side effects (nausea, diarrhea, weight loss) are common with apremilast in the first two weeks. Introduce new supplements gradually so you can distinguish drug side effects from supplement side effects.

Cyclosporine

Cyclosporine is metabolized by CYP3A4. Any supplement that induces or inhibits CYP3A4 alters cyclosporine blood levels. St. John's wort is absolutely contraindicated (reduces levels by 40 to 60%). Curcumin may have mild CYP3A4 effects; discuss with your dermatologist. Grapefruit juice (not a supplement, but often overlooked) increases cyclosporine levels.

Supplement Timing and Stacking

Splitting supplements across the day optimizes absorption and reduces GI burden. Fat-soluble supplements (vitamin D, fish oil, curcumin) require dietary fat. Probiotics survive gastric acid better on an empty stomach. Minerals compete for absorption when taken together.

Morning (with breakfast): Vitamin D3 (2,000 to 5,000 IU) + K2 (100 to 200 mcg). Fish oil half dose (1 to 2 g EPA + DHA). Both require dietary fat.

With lunch: Curcumin 500 mg with piperine. Fish oil remaining dose (1 to 2 g).

With dinner: Curcumin 500 mg (second dose). Selenium 100 to 200 mcg (if deficient). Zinc 15 to 30 mg. Milk thistle 150 to 300 mg (if on methotrexate).

Bedtime: Probiotic, minimum 10 billion CFU, multi-strain Lactobacillus/Bifidobacterium. Empty stomach.

If you take methotrexate, take your folate on a non-methotrexate day and separate mineral supplements from the drug dose by at least 2 hours.

The Diet Connection

Supplements work best when paired with an anti-inflammatory dietary pattern. The MEDIPSO trial demonstrated that a Mediterranean diet improved PASI scores in psoriasis patients, consistent with the broader evidence linking dietary patterns to systemic inflammation.

Psoriasis-specific dietary evidence points toward reducing alcohol, processed sugar, and refined carbohydrates (which spike insulin and IGF-1, both of which promote keratinocyte proliferation). Gluten elimination benefits a subset of patients, particularly those with elevated anti-gliadin antibodies. Weight loss in obese psoriasis patients consistently improves treatment response, independent of which treatment is used.

For a full dietary protocol, see our psoriasis diet and natural treatment guide. For cross-condition dietary comparison, see our autoimmune diet overview.

Frequently Asked Questions

What is the best supplement for psoriasis?

Curcumin has the strongest adjunctive evidence, with an odds ratio of 4.31 for reaching PASI 75 when added to standard treatment (Frontiers in Pharmacology 2022). Vitamin D correction is essential for deficient patients (common in psoriasis). Probiotics showed a PASI reduction of -3.09 across 7 RCTs. No single supplement replaces dermatological treatment. The greatest benefit comes from stacking several evidence-based supplements alongside medical therapy.

Does vitamin D help psoriasis?

Correcting a vitamin D deficiency helps. Supplementing above sufficient levels does not. The JAMA Dermatology 2023 RCT (122 patients, 20,000 IU/week) found no PASI improvement in patients who were not selected for deficiency. The 2025 network meta-analysis found vitamin D combined with NB-UVB phototherapy produced a PASI improvement of -3.29. Test your serum 25(OH)D level. Target 40 to 60 ng/mL.

Can I take supplements with biologics like secukinumab or adalimumab?

Vitamin D, fish oil, curcumin, and probiotics are compatible with biologics. No adverse interactions have been documented. The key restriction is avoiding immune-stimulating supplements (echinacea, elderberry, spirulina, ashwagandha) that work against the targeted immunosuppression biologics provide. Inform your dermatologist about all supplements.

Are probiotics good for psoriasis?

Two independent 2024 meta-analyses support probiotic use. Zhu et al. (7 RCTs, 400 patients) found PASI MD -3.09. Wei et al. (5 RCTs, 286 patients) confirmed superiority over placebo. Multi-strain Lactobacillus/Bifidobacterium formulations at 10+ billion CFU, taken for 12+ weeks, showed the most consistent results. The gut-skin axis provides the mechanistic basis: correcting intestinal dysbiosis reduces systemic Th17 activation.

What supplements should psoriasis patients avoid?

Immune-stimulating supplements top the list: echinacea, elderberry, spirulina, chlorella, ashwagandha, and astragalus. These amplify the overactive immune response driving psoriatic plaques. Supplemental vitamin A is dangerous if you take acitretin (additive retinoid toxicity). St. John's wort is contraindicated with cyclosporine (reduces drug levels by 40 to 60%). High-dose biotin above 5,000 mcg interferes with lab immunoassays.

Does fish oil reduce psoriasis plaques?

Fish oil produces a modest PASI reduction of -1.58 across 10 studies (BMC Dermatology 2019 meta-analysis). Four of eight systematic reviews in a 2024 umbrella review showed benefit; four did not. High-EPA formulations (2 to 4 g EPA + DHA/day) tend to perform better. Fish oil is a reasonable adjunct for anti-inflammatory support but should not be relied on as a standalone psoriasis treatment.

How long do psoriasis supplements take to work?

Probiotic trials required a minimum of 12 weeks to show PASI improvement. Curcumin trials ranged from 8 to 16 weeks. Vitamin D deficiency correction takes 8 to 12 weeks to reach target serum levels. Fish oil requires 8 to 12 weeks for membrane phospholipid incorporation. Set a 3-month minimum evaluation period before judging whether a supplement is working. Track your PASI score or photograph plaques monthly for objective comparison.

Building Your Psoriasis Supplement Protocol

Start with testing. Serum 25(OH)D, selenium, zinc, and a comprehensive metabolic panel give you a baseline. Correct documented deficiencies first. This step is non-negotiable and requires minimal evidence debate.

Add curcumin (1,000 mg/day bioavailable form) as the first therapeutic supplement. The PASI 75 odds ratio of 4.31 as an adjunct earns it priority.

Add fish oil (2 to 4 g EPA + DHA) and probiotics (multi-strain, 10+ billion CFU) as the second tier. Both have meta-analytic support and low risk profiles.

Review the drug interaction table above. Print it. Bring it to your next dermatology appointment. Your dermatologist needs to know what you are taking, and you need their guidance on timing and monitoring.

Consider low dose naltrexone as a discussion point with your prescriber if standard therapy provides incomplete relief. LDN modulates immune function through opioid growth factor receptor signaling and has preliminary evidence across multiple autoimmune conditions.

For gut healing support beyond probiotics, our BPC-157 gut healing guide covers the research on peptide-based mucosal repair.

Take the free 3-minute AutoimmuneFinder quiz to build a personalized, evidence-graded supplement protocol matched to your psoriasis severity, current medications, and lab results.

This article is for educational purposes only and does not constitute medical advice. Psoriasis is a chronic inflammatory condition requiring ongoing dermatological supervision. Do not start, stop, or change any supplement or medication without consulting your dermatologist or primary care physician. All dosage recommendations should be discussed with your healthcare provider before implementation.