Algo parecido com isto
Sub Henrique()
Dim labelRow As Long
Dim labelText As String
Dim i As Long
labelRow = 1
For i = 1 To 5
If Not IsEmpty(Sheet1.Cells(labelRow, i)) Then
labelText = labelText & Sheet1.Cells(labelRow, i) & " "
End If
Next
labelText = Trim$(labelText)
With UserForm1.Label1
.Caption = labelText
End With
End Sub