19 plant proteins and peptides assessed
Expert assessmentCIR panel 2022Skin and hair conditioning agents
The panel concludes that 18 of the 19 ingredients are safe under the conditions of use described; data are insufficient for a single protein, the sycamore maple one. The summary does not give the full list2.
Hydrolyzed wheat: a peptide size limit
Expert assessmentCIR panel 2018Hydrolyzed wheat protein and wheat gluten
No immediate hypersensitivity reaction in sensitized people and no sensitization when polypeptides do not exceed 30 amino acids. Conclusion: safe if the average molecular weight of the peptides stays at 3,500 Da or less3.
Soy: safe under conditions of use
Expert assessmentCIR panel 2023Soy proteins and peptides
The panel concludes that soy proteins and peptides are safe in the practices of use and concentration described4.
Facial soap with hydrolyzed wheat: a food allergy risk
Epidemiological studyJapan, women aged 20 to 54157 wheat allergy cases, 449 controlsOnline questionnaire
Use of a facial soap containing hydrolyzed wheat protein was associated with a higher risk of wheat allergy (adjusted odds ratio 2.6; 95% confidence interval 1.2 to 5.7). The result concerns one product and one origin, wheat9.
Protein hydrolysates in hair products: contact urticaria
Clinical study22 hydrolysates tested, 3 groups of participantsSkin tests
Positive reactions appeared in 12 participants, all atopic women, who all reacted to a quaternized collagen hydrolysate of animal origin. The authors conclude that these hydrolysates can cause contact urticaria, especially in atopic people10.