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Storage conditions that shorten unopened shelf life: heat (extended exposure above 25C), freezing and re-thawing (can crack the stopper seal), direct sunlight (degrades benzyl alcohol), and humid environments (can degrade label readability and obscure exp date)

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When blood levels of T 3 and T 4 begin to decline, bound T 3 and T 4 are released from these plasma proteins and readily cross the membrane of target cells

An airless pump packaging would really seal the deal but this is still absolutely a sunscreen I would recommend to anyone looking for great protection and a light, non-greasy finish