Probably you can do some sort of that, but the question is whether this would create the gold analogue of argyria:

https://en.wikipedia.org/wiki/Argyria

Thanks Sir Jürgen Weippert for your reply

Precious metals can be used to treat a variety of diseases. Gold in particular can be converted in a compound, such as gold sodium thiomalate, and used to reduce pain and inflammation from rheumatoid arthritis. However, gold compounds are rarely prescribed – and not just because of gold’s price and rarity.

When gold is introduced to the body parentally (e.g. via injection, infusion, etc.) over a long enough period of time, a skin condition known as chrysiasis develops. Chrysiasis is permanent, but causes no other effects to the body besides changing the color of the skin. When gold compounds are repeatedly administered, gold particles build up in the deep layers of skin. This build up, in addition to sun exposure, causes the skin to become blue-grey or grey-purple.

Argyria is an extremely similar condition that occurs when too much silver builds up in the body. The difference between the two conditions is that argyria produces a color closer to slate-grey or blue grey. Argyria can also onset from oral administration of silver, whereas chrysiasis cannot (which could explain why gold food seems to be much more popular than silver food).

There is a lot of work related to this topic, but currently this method is still in the stage of research and not suitable for use.

See those recent reviews for example : https://doi.org/10.1039/D2RA00566B

https://doi.org/10.1016/j.susmat.2019.e00109

Also as expressed by Mr Weippert, one of the question being currently asked is what becomes of the nanoparticles after the treatment (risks of long term toxicity).

Finally, gold salts, and gold nanoparticles are completely different objects from a chemistry point of view. I would wager their toxicity would be completly different both in mecanism and intensity.