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BERTHOLLETIA EXCELSA SEED OIL.

Valuable CAS 356065-50-4 / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

Commonly known as Brazil Nut Oil, this nutrient-dense botanical lipid is prized for its exceptional concentration of selenium and essential fatty acids. It functions as a sophisticated emollient that bridges the gap between deep barrier repair and active antioxidant protection.

Emollient Barrier Repair Antioxidant Sebum Regulator

Science

It operates through a dual-action pathway: forming an occlusive micro-film to halt trans-epidermal water loss (TEWL) while simultaneously delivering a 40% concentration of linoleic acid directly into the lipid matrix to reinforce structural integrity. Its native selenium and Vitamin E content neutralize oxidative stress by scavenging free radicals before they can trigger inflammatory cascades.


Research

High confidence
Effective range 7.5–100%
Optimal

7.5%

Key findings

  1. 01 A 7.5% concentration demonstrated a 52.43% reduction in surface sebum levels after 5 hours, proving it as a viable regulator for lipid-rich skin types.
  2. 02 Topical application of 100% pure oil showed significant improvements in hair fiber gloss and structural condition within a 14-day trial period.
  3. 03 High-load formulations (20-30%) maintain stable rheological profiles, acting as effective structural carriers for complex emulsions.

Transparency

Commonly dusted
Min. effective
5%
Red flag below
0.5%

While often included at trace levels (below 0.5%) for label appeal due to its exotic origin, clinical data suggests that a minimum of 7.5% is required to achieve measurable sebum-regulating benefits.


The Formula

Solubility
Oil
Optimal pH 5 – 7
0 7 14

Stability

Highly susceptible to rancidity via oxidation; must be stabilized with lipid-soluble antioxidants like Tocopherol. It maintains peak stability in O/W emulsions within a slightly acidic to neutral range.

Synergies

  • Tocopherol
  • BHT
  • Linoleic Acid

Conflicts

  • Oxidizing agents
  • Nitrosating agents
  • Triethanolamine (impurity risk)

Safety

CIR Status
Safe as used
Max tested
100%
Pregnancy
Safe
Sensitization risk Low

While CIR notes a 0.5% use in specific legacy baby products, the oil is non-toxic and safely utilized up to 100% in niche facial and hair applications. Raw material quality must be monitored for aflatoxins.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Moderate

Our Assessment

Valuable

An expertly balanced botanical oil that offers rare sebum-control properties alongside intensive barrier-restoring lipids.


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References