a substance, usually a liquid, with a magical power to cure, improve, or preserve something(通常为液体的)万灵药,灵丹妙药,长生不老药
It's yet another health product claiming to be the elixir of life/youth(= something to make you live longer/stay young).这又是一种号称灵丹妙药的保健产品,据说有延年益寿/永葆青春之奇效。