Ingredient review
Hydrolyzed Red Blood Cells
INCI: HYDROLYZED RED BLOOD CELLS
A novel protein ingredient that may help hydrate and soothe skin, but research is limited and it may not suit those avoiding animal-derived ingredients.
In plain English
Hydrolyzed red blood cells are made by breaking down animal red blood cells into smaller protein pieces. In skincare, these proteins can help attract and hold moisture to the skin's surface, potentially making the skin feel softer and more hydrated. Think of it as a gentle, protein-rich moisturizer ingredient, though it's not as well-studied as more common options like hyaluronic acid or glycerin.
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
Hydrolyzed Red Blood Cells 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 Hydrolyzed Red Blood Cells.
- 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 protein hydrolysate derived from animal red blood cells, typically from cows or pigs. The cells are broken down (hydrolyzed) into smaller peptides and amino acids, which are then used in cosmetic formulations.
How it works
The small protein fragments from hydrolyzed red blood cells can act as humectants, drawing water into the outer layer of the skin. They may also provide a temporary film-forming effect that helps reduce water loss, leaving the skin feeling smoother and more supple.
Pros
Potential hydration boost
The hydrolyzed proteins may help attract and retain moisture in the skin, offering a gentle hydrating effect for dry skin types.
Novel ingredient
For those interested in trying unique, less common ingredients, hydrolyzed red blood cells offer a different approach to skin conditioning.
Cons and cautions
Animal-derived
This ingredient comes from animal blood, making it unsuitable for vegans, vegetarians, or anyone seeking plant-based or synthetic alternatives.
Limited research
There is very little published scientific evidence on the effectiveness or long-term safety of hydrolyzed red blood cells in skincare, so its benefits are not well-established.
Best for
- Those looking for a novel protein-based moisturizer
- People with dry or dehydrated skin seeking extra hydration
Use caution if
- Vegans and vegetarians
- Anyone with known allergies to animal-derived proteins
Usage tips
Safety summary
Hydrolyzed red blood cells are considered low-risk for irritation and comedogenicity, but the lack of robust safety data and the animal-derived nature may be concerns for some users.
Research notes
Scientific literature on hydrolyzed red blood cells in cosmetics is sparse. Most information comes from product marketing rather than peer-reviewed studies, so efficacy claims should be viewed with caution.
Common label clues
- Typical concentration
- Typically used at 0.5% to 2% in leave-on products
- Regulatory status
- Generally considered safe for use in cosmetics by the FDA and EU CosIng database, but specific concentration limits are not established.
- Common uses
- Serums, Moisturizers, Eye creams
- Environmental note
- Sourcing involves animal by-products, which may raise ethical and environmental concerns depending on farming practices.
Good to know
- Hydrolyzed red blood cells are sometimes listed under other names like 'Hydrolyzed Hemoglobin' or 'Hydrolyzed Blood Cells'.
- This ingredient is more common in Asian beauty products than in Western formulations.
Common questions
What is Hydrolyzed Red Blood Cells in beauty products?
Hydrolyzed red blood cells are made by breaking down animal red blood cells into smaller protein pieces. In skincare, these proteins can help attract and hold moisture to the skin's surface, potentially making the skin feel softer and more hydrated. Think of it as a gentle, protein-rich moisturizer ingredient, though it's not as well-studied as more common options like hyaluronic acid or glycerin.
What does Hydrolyzed Red Blood Cells do in a beauty product?
The small protein fragments from hydrolyzed red blood cells can act as humectants, drawing water into the outer layer of the skin. They may also provide a temporary film-forming effect that helps reduce water loss, leaving the skin feeling smoother and more supple.
Is Hydrolyzed Red Blood Cells safe for most people?
Hydrolyzed red blood cells are considered low-risk for irritation and comedogenicity, but the lack of robust safety data and the animal-derived nature may be concerns for some users.
Who should be careful with Hydrolyzed Red Blood Cells?
Vegans and vegetarians Anyone with known allergies to animal-derived proteins
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.