Hey ,
You’re right! Hydroxocobalamin is one of the forms of vitamin B12 that is found in nature (it is made in the bacteria in the gut for example and it’s also found in small amount in foods). Hydroxocobalamin can also be used by the body to make the biological active forms of vitamin B12: methylcobalamin and adenosylcobalamin.
Although you find it less used in supplements, it is used as a prescription injection to treat someone who is low in vitamin B12.
It is a supplement you can try safely