%%[
Set @product_id = '44723,44724,44725,44726,44727'
Set @id_rowset = BuildRowsetFromString(@product_id,",")
set @id_row_count = RowCount(@id_rowset)
if @id_row_count > 0 then
for @i = 1 TO @id_row_count do
Set @row = Row(@id_rowset, @i)
Set @display_product = Field(@row,1)
]%%
%%=ContentBlockByKey(@display_product)=%%<br>
%%[ next @i endif ]%%Output:
44723 content displays here
44724 content displays here
44725 content displays here
44726 content displays here
44727 content displays here
