The certificate [1] linked on the page provides more detail. Some quotes: > This Standard Reference Material (SRM) is intended primarily for use in validating

The certificate [1] linked on the page provides more detail. Some quotes: > This Standard Reference Material (SRM) is intended primarily for use in validating methods for determining proximates, fatty acids, calories, vitamins, elements, amino acids, and aflatoxins in peanut butter and similar matrices. This SRM can also be used for quality assurance when assigning values to in-house reference materials. > SRM 2387 IS INTENDED FOR LABORATORY USE ONLY, NOT FOR HUMAN CONSUMPTION. > The SRM is a creamy peanut butter prepared by a manufacturer of peanut butter products. > Source and Preparation: SRM 2387 is creamy peanut butter containing roasted peanuts, sugar, partially hydrogenated vegetable oils (48 % rapeseed, 40 % cottonseed, and 12 % soybean oil), and salt, and was prepared for NIST as part of a larger production run. [1] https://tsapps.nist.gov/srmext/certificates/2387.pdf https://tsapps.nist.gov/srmext/certificates/2387.pdf