Have a specification ready for quotation review? Send the D3-only or D3 + K2 direction, ingredient forms, amount and unit per serving, carrier, bottle/dropper, estimated quantity and destination country. Mark which items are fixed and which alternatives you would consider, so any proposed supply can be compared against the same brief.
Updating an existing product? Share a label or specification you are entitled to use and identify the changes you want reviewed, such as the vitamin combination, serving concentration, carrier or dispensing format. Separate the elements you want to retain from those you want to change; a reference product does not confirm an identical formula or supply.
Starting from an idea? Send your destination country, intended users, D3-only or D3 + K2 preference and estimated quantity, and mark undecided details as open. You do not need a complete formula to start a discussion. The specification, sample scope and supply terms require project-specific confirmation.