I am using kitchen paint for cupboard told it is ok do I need varnish

What is the cabinet made of?

Hi Caroline. I would not think so. However....read the directions on the back for best results. I think the more you know about your paint, the better results you’ll have.

http://www.goodhousekeeping.com/home/renovation/tips/a31753/painting-cabinet-mistakes/

Hello! Be sure to prime your cabinets first. Then apply two coats of paint And finish with a sealant to protect your cabinets. This may be overkill, but here is a step-by-step guide on painting kitchen cabinets, which you may find useful. Click on the link below to view. Good luck!

https://www.confessionsofaserialdiyer.com/how-to-paint-kitchen-cabinets-a-step-by-step-guide/

Kitchen paint probably just means it's a washable semi gloss. That should be fine as long as you follow Janet's guidelines. A really good latex enamel gloss or semi gloss probably won't require a sealant as long as you properly prepped before painting.

OK to use the paint. AND no to varnish. It yellows over time. Use at least three coats of a water base polyurethane.