The makers of Red Bull have insisted it is "perfectly safe" after an off licence chain banned youngsters from buying the energy drink.
Youngsters buying Red Bull are being asked for ID
The Scottish firm One o One has refused to sell Red Bull to under-16s because of its caffeine content.
One o One is run by George King, the father of entertainment tycoon Stefan King, who runs bars and clubs in Glasgow, Dundee and Aberdeen.
Red Bull said it was discussing the ban with One o One.
A spokeswoman said: "Red Bull is perfectly safe to drink and there is no medical evidence to suggest otherwise.
"We are aware that One o One has asked staff not to sell the drink to under-16s and we are in talks with them at the moment.
"There is no legal age restriction on the purchase of Red Bull, but it is generally considered that products containing caffeine are not suitable for young children, as they do not need an extra boost of energy."
One o One, which has stores across Glasgow and Paisley, has told staff to use their discretion to ask customers buying Red Bull for proof of ID.
Advertised under the slogan 'Red Bull gives you wings', each can contains 80mg of caffeine - the same amount as a cup of coffee.