Bolt Threads

b-silk

Date of certification: 10.11.2022

Test number

221.047.8.1
221.047.8.2
221.047.8.3
221.047.8.4
221.047.8.5
221.047.8.6

Grade

1.8
1.5
1.7
1.5
1.6
1.7

Tested according to

MyMicrobiome Standard 18.10 - Face & Body microbiome

MyMicrobiome Standard 19.10 - Scalp microbiome

MyMicrobiome Standard 21.10 - Vaginal microbiome

Product description according to manufacturer:

B-SILK™ PROTEIN by Bolt Threads is an unprecedented vegan, biodegradable silk polypeptide that delivers a multitude of benefits to skin and hair while alleviating the need for linear silicones, silicone elastomers and keratin in formulations. It provides anti-aging effects by attenuating the negative impacts of pollution, blue light and UV. It provides multifaceted functionality to formulations in that it acts as a defensive film-former, texturizer and viscosity enhancer while also delivering a unique cushioning sensation and lightweight long-lasting wear. It reduces greasiness and tackiness in sunscreens and color cosmetics and provides weightless volume to hair and lashes. B-SILK™ PROTEIN is stable, microbiome-friendly, bio-based, plastic-free, cruelty-free, has neutral odor and color and is easily incorporated into a variety of formulation types.

boltthreads.com

Test result
Test description
Protocols

The results are evaluated with grades from 1 (one) to 3 (three).
If the product shows no or positive influence to the above-mentioned aspects, a grade of 1 is awarded respectively.
If only a very weak negative influence can be detected in the tests, the grade 2 is awarded and in case of a clearly negative influence, the product receives the grade 3.

The product has passed up to grade 2.0.

MyMicrobiome Standard 18.10 - Leave on

Test	Grade
Balance of the skin microbiome	1.0
Diversity of the corresponding skin microbiome (sebaceous, x2)	2.3
Diversity of the corresponding skin microbiome (dry, x2)	2.3
Skin-product contact direct (sebaceous, x2)	1.9
Skin-product contact direct (dry, x2)	1.5
Skin-product contact indirect (sebaceous)	1.7
Skin-product contact indirect (dry)	1.3
Overall grade	1.8

MyMicrobiome Standard 18.10 - Rinse off

Test	Grade
Balance of the skin microbiome	2.0
Diversity of the corresponding skin microbiome (sebaceous, x2)	1.1
Diversity of the corresponding skin microbiome (dry, x2)	1.2
Skin-product contact direct (sebaceous, x2)	1.9
Skin-product contact direct (dry, x2)	1.5
Skin-product contact indirect (sebaceous)	1.7
Skin-product contact indirect (dry)	1.3
Overall grade	1.5

MyMicrobiome Standard 19.10 - Leave on

Test	Grade
Balance of the scalp microbiome	1.0
Diversity of the corresponding scalp microbiome (x2)	2.5
Scalp-product contact direct ( x2)	1.5
Scalp-product contact indirect	1.3
Overall grade	1.7

MyMicrobiome Standard 19.10 - Rinse off

Test	Grade
Balance of the scalp microbiome	2.0
Diversity of the corresponding scalp microbiome (x2)	1.3
Scalp-product contact direct ( x2)	1.5
Scalp-product contact indirect	1.5
Overall grade	1.5

MyMicrobiome Standard 21.10 - Leave on

Test	Grade
Balance of the skin microbiome	1.0
Diversity of the corresponding skin microbiome (x2)	1.0
Skin-product contact direct (x2)	2.7
Skin-product contact indirect	1.0
Overall grade	1.6

MyMicrobiome Standard 21.10 - Rinse off

Test	Grade
Balance of the skin microbiome	1.0
Diversity of the corresponding skin microbiome (x2)	1.3
Skin-product contact direct (x2)	2.7
Skin-product contact indirect	1.0
Overall grade	1.7

The MyMicrobiome Standard evaluates cosmetic and personal care products, that encounter the skin or mucous membrane, in terms of their influence on the microbiome located at a specific body site.

An intact skin microbiome has a fundamental influence on skin health. Products which are to be skin-friendly must also be Microbiome-friendly in order not to unbalance the skin of the user.

The MyMicrobiome Standard evaluates the influence of cosmetic and personal care products on the microbial key players of a specific skin or mucous membrane area. The human microbiome is very individual from person to person.

Each area, however, harbors a characteristic composition of bacteria, viruses and fungi. The test examines the products influence on the key organisms typical for each skin area and thus offers a standardized procedure.

Here you can find an overview of our testing standards: MyMicrobiome Standard