A subscription offer for the magazine offered free Carlsberg and a branded limited edition glass, but Emap admitted that it had not mentioned that the promotion was limited to over-18s.
The ASA investigated the matter after receiving a complaint from a member of the public and also looked into whether Zoo should run any alcohol advertising or promotions.
Under ASA rules, if 25% or more of a magazine's readership is under 18, the title is deemed unsuitable for alcohol advertising.
Zoo escaped censure because National Readership Survey figures show that about 17% of its readers are minors. At IPC's rival men's weekly Nuts, under-18s make up 15% of its audience.
The ASA also upheld complaints against Express Newspapers for a chocolate bar promotion.
It said that a front-page flash promising a "free" Toblerone bar for every reader was misleading because a clause stating that it was a two-for-one offer was not prominent enough.
The ASA investigated the matter after receiving a complaint from a member of the public and also looked into whether Zoo should run any alcohol advertising or promotions.
Under ASA rules, if 25% or more of a magazine's readership is under 18, the title is deemed unsuitable for alcohol advertising.
Zoo escaped censure because National Readership Survey figures show that about 17% of its readers are minors. At IPC's rival men's weekly Nuts, under-18s make up 15% of its audience.
The ASA also upheld complaints against Express Newspapers for a chocolate bar promotion.
It said that a front-page flash promising a "free" Toblerone bar for every reader was misleading because a clause stating that it was a two-for-one offer was not prominent enough.
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