Aha, it was (still is) called "ryibiy zhir" ("fish fat"),- i was given it too when i was little, because ALL parents were compelled (by so-called therapists), that kids need these fish fat capsules to get Omega fatty acids and other vitamins. As a soviet kid, you simply couldn't avoid it. But it wasn't always like that,- it had been worse. In the 60th, it (fish fat) was in a liquid form only. E.g. my dad had to swallow this gruesome liquid as it is. Bleh...Luckily, i avoided that fate: in the 80th, capsules appeared and i had to devour those capsules. But i hated them anyway, because their taste was still impressively repulsive, even from the outside (plus they were stinky). It was nauseating.
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It was given to children to prevent rickets. Nowadays, it is given in the form of liquid drops:

Vitamins for children
Find out why vitamins are important for the health of your baby or young child, and which vitamin supplements they should take.
