We saw a glimpse of this in the anime actually during Goku's fight with Beerus. Beerus landed a particularly nasty blow that might have proved fatal had Goku not healed the damage with his newfound god power.
After this arc, this power is never seen again. But there is another aspect of the form that indicates some sort of revitalizing effect and that's the fact that when using SSG Goku and Vegeta are visibly younger. This is similar to a character named Genkai from Yu-Yu Hakusho who is normally an old mentor to the main character Yusuke.

Whenever Genkai uses her Spirit Wave technique, she takes on the form of her younger self at her prime similar to SSG. The technique allows for a wide range of abilities, including healing.

The perpetual youth granted by SSG indicates that the form is revitalizing its users so to some degree IT IS HEALING THEM but what I'm saying is that the degree should be cranked up to 11 and useful for combat.

As is, sensu beans are our main source of healing and they heal instantly but Sensu aren't always in convenient supply such as during the final battle with Buu. I think SSG should heal at a fairly decent rate by default resulting in a tame regeneration effect with no drawbacks. The only downside would be that you have to be in the form which means you're weaker than you would be as an SSB, UI, or Hakaishin/Ego. The actual drawback comes when you need to heal faster or your healing some major damage. Something like that should burn through ki and leave you drained, but at default, I think SSG should even be used to regenerate lost energy.
You know how Goku could simply sit down and rest to build up his ki/stamina reserves? I think SSG should do that naturally unless you're burning through ki healing massive damage.
Then I think branching from that would be the ability to heal others, with similar rules. Healing massive damage or healing really quickly requires a huge ki investment.
Ideally, I'd want to tone down Saiyans and stop giving them more shit, but since the series doesn't seem to be slowing down with this aspect, how's about we pile on a few more useful ones. What do you all think?





