Ingredient review
Methotrexate
INCI: METHOTREXATE
Methotrexate is a potent prescription drug, not a cosmetic ingredient, and should never be used in skincare products.
In plain English
Methotrexate is a strong medication that doctors prescribe for serious conditions like severe psoriasis, rheumatoid arthritis, and some cancers. It works by slowing down cell growth and calming the immune system. Because it can cause serious side effects, it is not allowed in any cosmetic or over-the-counter skincare product. You should never use a product containing methotrexate without a doctor's supervision.
Review score
Safety, usefulness, and evidence
Higher-caution ingredient
The evidence base is relatively strong for its common cosmetic role.
Main practical flags: irritation is high; clogging risk is low.
- Source
- synthetic
- Evidence
- strong
- Irritation
- high
- Clogging risk
- low
Quick decision guide
Read the cautions before using
Methotrexate can be useful, but watch for high irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Methotrexate.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
highMore likely to cause dryness, stinging, peeling, or reactivity if used too aggressively.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
Methotrexate is a synthetic drug that belongs to a class of medications called antimetabolites. It was originally developed for cancer treatment and is now also used at lower doses for autoimmune and inflammatory conditions. It is not a cosmetic ingredient and is strictly regulated as a prescription medicine.
How it works
In a medical context, methotrexate works by blocking an enzyme called dihydrofolate reductase, which is needed for cells to make DNA. This slows down the rapid growth of certain cells, such as skin cells in psoriasis or immune cells in rheumatoid arthritis. In cosmetics, it has no legitimate function and is considered unsafe for topical use without medical oversight.
Pros
Effective for severe conditions
When used under medical supervision, methotrexate can significantly improve severe psoriasis and rheumatoid arthritis, reducing symptoms and improving quality of life.
Long history of medical use
Methotrexate has been used for decades in medicine, and its benefits and risks are well understood by healthcare professionals.
Cons and cautions
Not a cosmetic ingredient
Methotrexate is a potent prescription drug with serious side effects. It is not approved for use in any cosmetic or over-the-counter skincare product.
High risk of toxicity
Even small amounts absorbed through the skin can cause liver damage, lung inflammation, and bone marrow suppression. This makes it dangerous for unregulated cosmetic use.
Best for
- Patients with severe psoriasis under a doctor's care
- Individuals with rheumatoid arthritis or certain cancers as prescribed
Use caution if
- Anyone without a prescription from a licensed healthcare provider
- Pregnant women or those planning pregnancy (can cause birth defects)
- People with liver disease, kidney disease, or blood disorders
Usage tips
Safety summary
Methotrexate is a powerful prescription medication with a narrow safety margin. It can cause serious side effects including liver toxicity, lung damage, and bone marrow suppression. It is not safe for cosmetic use and should only be used under strict medical supervision for approved conditions.
Research notes
Extensive clinical research supports the efficacy of methotrexate for severe psoriasis, rheumatoid arthritis, and certain cancers. However, there is no research supporting its use in cosmetics, and studies highlight significant risks of toxicity even with topical application.
Common label clues
- Typical concentration
- Not applicable in cosmetics; used in prescription formulations only
- Regulatory status
- Methotrexate is a prescription-only drug regulated by the FDA and similar agencies worldwide. It is not listed as a permitted cosmetic ingredient in the EU, US, or other major markets. Any cosmetic product containing methotrexate is considered adulterated and illegal.
- Common uses
- Prescription treatment for severe psoriasis, rheumatoid arthritis, and certain cancers
- Environmental note
- Methotrexate can be harmful to aquatic life if released into waterways. Proper disposal of unused medication is important to protect the environment.
Good to know
- Methotrexate is sometimes confused with 'methacrylate' or other cosmetic ingredients, but they are completely different
- The FDA has not approved methotrexate for cosmetic use, and it is classified as a prescription drug
- If you see methotrexate listed in a skincare product, do not use it and report it to the FDA
Common questions
What is Methotrexate in beauty products?
Methotrexate is a strong medication that doctors prescribe for serious conditions like severe psoriasis, rheumatoid arthritis, and some cancers. It works by slowing down cell growth and calming the immune system. Because it can cause serious side effects, it is not allowed in any cosmetic or over-the-counter skincare product. You should never use a product containing methotrexate without a doctor's supervision.
What does Methotrexate do in a beauty product?
In a medical context, methotrexate works by blocking an enzyme called dihydrofolate reductase, which is needed for cells to make DNA. This slows down the rapid growth of certain cells, such as skin cells in psoriasis or immune cells in rheumatoid arthritis. In cosmetics, it has no legitimate function and is considered unsafe for topical use without medical oversight.
Is Methotrexate safe for most people?
Methotrexate is a powerful prescription medication with a narrow safety margin. It can cause serious side effects including liver toxicity, lung damage, and bone marrow suppression. It is not safe for cosmetic use and should only be used under strict medical supervision for approved conditions.
Who should be careful with Methotrexate?
Anyone without a prescription from a licensed healthcare provider Pregnant women or those planning pregnancy (can cause birth defects) People with liver disease, kidney disease, or blood disorders
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.