I'd use tung oil.

We would have to know what type of finish is on the table first.

"To protect your natural wood tabletop, always use coasters, trivets and
table pads. Do not drag objects across the surface, and blot spills
immediately with a clean, damp cloth."

Many furniture makers are skipping the finishing steps to save money and selling things with just a coat of wax on it, like RH does. Or no finish at all, calling it "natural wood"

I'd use a coat or several of penetrating clear oil finish, matte or satin gloss.

As "sloyder" stated, it is difficult to know for sure unless we know if the table is just stained, or if it has a finish on it. You may be able to do a brush on polyurethane over the top if it is stained. You could try it on the underside of the table and see if it takes. We use Waterlox products on most of our kitchen counters and dining table projects. It is a tung oil based product, but it penetrates the wood, so only works if the wood has not been sealed (stain is okay). Poly sits on top of the wood, so might be worth a try.

?

Waterlox is a varnish, as are "poly" finishes. While I like it a lot, and used it to refinish my daughter's dining table, it's a varnish. It just happens to be made from phenolic resin and tung oil instead of alkyd and poly resins and linseed oil. I've always considered it the difference between rye bread and whole wheat bread. They're both bread but have slightly different characteristics because their ingredients. Whole wheat bread is not "whole wheat" it's a product made from it.

In the hundreds of pages on their web site, there are only one or two that reveal it's a varnish, and the rest are all cashing in on the "tung oil hype." Here's one quote from their site: "By definition, Waterlox Original Tung oil finishes are “phenolic modified Tung oil-based varnishes”."