Member’s Mark vodka sold at Sam’s Club is generally described as a wheat vodka made in France, with the product materials pointing to premium wheat and spring water rather than a grain blend or corn base.

Grain source

  • The clearest source says it is made with select premium wheat from France.
  • Another review describes it as made from 100% wheat.
  • I did not find a reliable source in the gathered results saying it is made from rye, corn, or barley.

What that means

  • In plain terms, the grain is wheat.
  • If you were asking about a specific bottle variation, the exact sourcing can sometimes differ by product line, but the Sam’s Club Member’s Mark vodka results here consistently point to wheat-based vodka.

Note

  • Some third-party pages speculate about other ingredients, but the more direct product descriptions align on wheat.

TL;DR: Member’s Mark vodka is made from wheat, not corn or rye, based on the sources found.