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Glycerin

Humectant that helps a formula retain water. Usefulness depends on the complete formula and humidity; the ingredient alone does not prove moisturization performance.

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Ingredient family
Humectant
Source labels checked
July 21, 2026

Read it through four separate lenses.

03

Environmental evidence

Lower identified human hazard

A relevant cosmetic safety assessment is available. Environmental endpoint and production-route data remain separate questions.

See the environmental limits
04

Sensitivity + confidence

Assessed cosmetic use

CIR concluded that glycerin is safe in the cosmetic practices of use and concentrations assessed.

High confidence
Claim boundary

A useful formula role is not proof of beard growth, treatment of a skin condition, lower environmental impact, or suitability for every person. Finished-product behavior depends on concentration, processing, the rest of the formula, use pattern, and individual response.

Compare the formula job

Compare humectants in formula context

Humectants help a formula manage water, but the surrounding emollients, preservation, climate, and use pattern still shape the result.

Open the comparison

Human + environmental evidence

What deserves attention—and why.

Hazard is not the same as real-world risk. Exposure, dose, formula, wastewater treatment, farming location, and supplier controls can change the conclusion.

Screening priorityLower identified human hazard

A relevant cosmetic safety assessment is available. Environmental endpoint and production-route data remain separate questions.

Human useAssessed cosmetic use

CIR concluded that glycerin is safe in the cosmetic practices of use and concentrations assessed.

Fish + aquatic animalsExact release assessment missing

No exact-grade aquatic endpoint and finished-product environmental concentration are assigned; lower human hazard does not prove lower aquatic impact.

Plants + land wildlifeNo plant-specific concern identified

No product-level phytotoxicity conclusion is assigned, and feedstock land impacts depend on the undisclosed production route.

Persistence + fateSupplier fate data needed

The safety assessment does not replace biodegradation, bioaccumulation, wastewater-removal, and transformation data.

Supply-chain issueFeedstock route not disclosed

This material may be made from plant, fermentation, animal, or petrochemical inputs depending on grade; the label does not identify the route.

Why this is usefulDecision boundary

The current evidence supports the assessed cosmetic use, not a blanket “non-toxic,” biodegradable, or sustainable claim.

Better sourcing

What to ask the supplier for.

Ask the supplier to identify feedstock and process. For palm-, palm-kernel-, coconut-, or soy-derived input, require no-conversion origin and chain of custody; for fermentation or petrochemical routes, compare energy, emissions, and measured fate rather than relying on “natural” or “renewable.”

Product occurrence ledger

Where we found it.

List position is a location clue only. It is not a concentration estimate, and formulas can change after our source check.

ProductProduct typeExact label wordingList positionSource checkResearch links
Beardbrand Beard Oil Oil Glycerin Near the end July 21, 2026Recorded label snapshot Open product research Official source
Cremo Casked Vanilla Beard & Scruff Cream Conditioner Glycerin Near the beginning July 21, 2026Recorded label snapshot Open product research Official source
Scotch Porter Beard Wash Wash Glycerin Near the beginning July 21, 2026Partial snapshot; official label linked Open product research Official source

Human clinical results

What controlled tests add to this record.

An ingredient study is not a trial of every product containing that ingredient.

Controlled human study

Randomized, double-blind study with glycerol and paraffin in uremic xerosis

Design
Randomized, double-blind, intraindividual, multicenter comparison lasting 7 days.
Participants
100 adults with moderate-to-severe uremic xerosis; 99 were analyzed.
Measured result
Clinical response was 73% on legs treated with the glycerol/paraffin emulsion versus 44% with the comparator emulsion (P < .0001). Objective scaling also favored the test emulsion (P < .0001).
Why it is useful
Supports a narrow conclusion that a specified glycerol/paraffin formula can improve clinically dry skin under controlled conditions.
Transfer limits
Short study; diseased lower-leg skin; combination formula; no healthy facial skin, beard hair, isolated glycerin, or finished beard product was tested.

Open the trial source

What remains unknown.

Concentration

Exact level is not disclosed on the product labels we recorded.

Extraction / processing

Grade, refining, solvents, and other processing details are usually absent.

Impurities

Residuals and contaminants are not specified by an ordinary INCI list.

Formula interactions

Synergy or antagonism with other ingredients is a finished-formula question.

Product footprint

Manufacturing, transport, packaging, dose, and disposal remain outside an ingredient-only profile.

Evidence ledger

Open the source behind the summary.

A source supports only the claim named beside it. Database inclusion is not a blanket approval, and an assessed ingredient does not rate every finished product.

  1. 01
    Clinical Journal of the American Society of Nephrology (PubMed record)

    Randomized, double-blind study with glycerol and paraffin in uremic xerosis

    A human clinical result for a defined 15% glycerol and 10% paraffin emulsion; it does not isolate glycerin or test a beard product.

    Last checked July 14, 2026
  2. 02
    Cosmetic Ingredient Review

    Glycerin safety assessment

    The panel conclusion for glycerin in the cosmetic uses and concentrations assessed.

    Last checked July 13, 2026
  3. 03
    Cosmetic Ingredient Review

    How CIR safety assessments work

    Why an assessment is tied to cosmetic uses and concentrations and why insufficient data is not a safe-or-unsafe verdict.

    Last checked July 13, 2026
  4. 04
    European Commission

    CosIng cosmetic ingredient database

    Standard ingredient names and cosmetic functions. Database inclusion is not, by itself, a safety approval.

    Last checked July 13, 2026
  5. 05
    U.S. Environmental Protection Agency

    Safer Choice master criteria for safer chemical ingredients

    The screening framework used here: human toxicity, aquatic toxicity, persistence, and bioaccumulation are separate endpoints and must be judged within a chemical's functional class.

    Last checked July 14, 2026
  6. 06
    Roundtable on Sustainable Palm Oil

    RSPO production and supply-chain standards

    The standards define requirements for certified oil-palm production and chain-of-custody. Identity Preserved or Segregated supply offers stronger physical traceability than an undisclosed palm-derived feedstock.

    Last checked July 14, 2026
  7. 07
    Nature Food

    Oil-crop supply chains and global biodiversity loss

    A spatial supply-chain analysis found that oil-palm, coconut, and soybean cultivation accounted for most modeled oil-crop biodiversity impacts, concentrated in tropical regions. It supports traceable, location-specific screening rather than blanket substitution.

    Last checked July 14, 2026
Read the Evidence Standard Report an ingredient error