you can use the matchfound property of the combobox to know if the item already exists
try like this
vb Code:
For i = 9 To 88 Me.cboChemical.Text = Sheets("Solvent").Cells(i, 1) If Not Me.cboChemical.MatchFound And Not Me.cboChemical.Text Then Me.cboChemical.AddItem Me.cboChemical.Text End If Next




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