# What is the concentration of Illumina adapters and primers?

Reagent composition and concentrations are **proprietary**; Illumina support is not able to access or share this information.

Index adapters and primers are supplied at the correct working concentration for use in compatible Illumina library preparation protocols. See the relevant library preparation reference guide for for determining the volume of adapters or primers to use.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #5459), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000005459%20-%20Library%20Preparation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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