UV protection for wood against darkening

Hello everyone,

what are the practical experiences regarding UV-protection stains/oils/waxes/"products" for wood indoors, so that it does not darken further? Does it work well or is the darkening only delayed by a few years?
Feel free to also provide product recommendations

Thank you very much

The parquet expert told us yesterday that Tung oil is the best for preserving the wood in the long term.

I have a new solid glued laminated ceiling made of spruce. Therefore, the mechanical stress is negligible.

It is also supposed to help against fading

There are oil-based products from the company diotrol that prevent darkening.