I found this article/add in a copy of the Daily Mirror from January 2nd 1924.
Made me laugh.

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I see you finally got that time machine to work then.

5 Mars bars a day does very much the same thing!!

I have a jar which I unearthed one day while digging. It contained something called Virol which it says is a preparation of bone marrow, an ideal fat food for children and invalids. They didn't worry about crap like hardening of the arteries and stuff like that in those days.

I remember my mum giving me drpping on toast when i was a kidTried it again not so long ago and nearly puked