{assign var=$products value=$something->get_products_by_category("vitamins")}
{foreach $products}
    {* 
        yadda yadda this syntax doesn't cut it
        because it's too complicated 
    *}
{/foreach}


{cycle_products category="vitamins"}
    <div id="{$product_id}">
        <h1>{$product_name}</h1>
        <p>{$product_description}</p>
        <img src="{$product_image}">
    </div>
{/cycle_products}