Ingredient review
Magnesium Lithospermate B
INCI: MAGNESIUM LITHOSPERMATE B
A promising plant antioxidant with early research suggesting it may help calm and protect skin, but more human studies are needed to confirm its benefits.
In plain English
Magnesium Lithospermate B is a compound found in a traditional Chinese herb called Lithospermum erythrorhizon (also known as purple gromwell). In skincare, it's used as an antioxidant to help neutralize free radicals—unstable molecules that can damage skin cells and speed up aging. Early lab studies also suggest it may help reduce inflammation and protect collagen, but we don't yet have strong evidence from human trials to know how well it works in a cream or serum.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- natural
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Magnesium Lithospermate B is generally a lower-concern ingredient when the full formula suits your skin.
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 Magnesium Lithospermate B.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A magnesium salt of lithospermic acid B, a polyphenolic compound extracted from the roots of Lithospermum erythrorhizon, a plant used in traditional medicine.
How it works
It acts as an antioxidant by donating electrons to neutralize free radicals, potentially reducing oxidative stress on skin. It may also inhibit certain enzymes (like collagenase) that break down collagen, and calm inflammatory pathways in skin cells.
Pros
Gentle antioxidant
Early research suggests it can neutralize free radicals without irritating skin, making it a good option for sensitive skin types.
Potential collagen support
Lab studies indicate it may help inhibit collagen breakdown, which could support firmer-looking skin over time.
Cons and cautions
Limited human evidence
Most studies are in test tubes or animals; we don't yet have strong proof that it works as well in real-world skincare products.
Uncertain stability
As a plant-derived polyphenol, its stability in formulas (especially with light and air) is not well-documented, which could affect its effectiveness.
Best for
- Anyone looking for additional antioxidant protection
- People with sensitive or reactive skin seeking a gentle calming ingredient
Use caution if
- Those who prefer ingredients with strong human clinical data
Usage tips
Safety summary
Available data suggests low irritation and allergy potential, but comprehensive safety studies on long-term topical use are lacking.
Research notes
Most evidence comes from in vitro (lab) and animal studies showing antioxidant and anti-inflammatory activity. Human clinical trials on topical application are very limited.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Generally recognized as safe for cosmetic use in many regions, though not specifically approved by the FDA as a drug ingredient.
- Common uses
- Anti-aging serums, Soothing treatments
- Environmental note
- Sourced from a plant that can be cultivated, but wild harvesting of Lithospermum species has raised sustainability concerns in some regions.
Good to know
- This ingredient is sometimes listed as part of a complex extract rather than a standalone compound.
- It is not related to magnesium stearate or other common magnesium salts used in cosmetics.
Common questions
What is Magnesium Lithospermate B in beauty products?
Magnesium Lithospermate B is a compound found in a traditional Chinese herb called Lithospermum erythrorhizon (also known as purple gromwell). In skincare, it's used as an antioxidant to help neutralize free radicals—unstable molecules that can damage skin cells and speed up aging. Early lab studies also suggest it may help reduce inflammation and protect collagen, but we don't yet have strong evidence from human trials to know how well it works in a cream or serum.
What does Magnesium Lithospermate B do in a beauty product?
It acts as an antioxidant by donating electrons to neutralize free radicals, potentially reducing oxidative stress on skin. It may also inhibit certain enzymes (like collagenase) that break down collagen, and calm inflammatory pathways in skin cells.
Is Magnesium Lithospermate B safe for most people?
Available data suggests low irritation and allergy potential, but comprehensive safety studies on long-term topical use are lacking.
Who should be careful with Magnesium Lithospermate B?
Those who prefer ingredients with strong human clinical data
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.