freshness and potency guaranteed through
through 的後面應該是留給出廠時、打上相對應的有效期限
所以整句意思為“鮮度暨效能期保證至“XX 日期
新鮮度及效果滿意保證
Freshness新鮮
potency-效果、效力
Guaranteed-保證
through-在這裡當成達到某種程度的滿意