
Kourtney Kardashian and her partners at her buzzy health supplement brand Lemme experienced a crazy heist last week -- 'cause someone jacked their s*** ... and left a ransom note!
Sources with direct knowledge tell TMZ ... a truck stationed at a facility that Kourtney and co. are using to ship out product for her Lemme brand was stolen from the premises of the warehouse it was at this past weekend, out in the San Fernando Valley here in SoCal.

We're told this happened at the logistics facility Kourtney and her team use for Lemme products -- and this truck that was taken contained upwards of $4 million worth of Lemme Burn ... one of her top-selling products in the Lemme lineup.
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