I have reduced batches of 500mL, colloidal gold with sodium citrate and .5 gram ascorbic acid. This produces a deep gold color; about the same color as the electrode itself.
If it isn't ruby red, purple, or blue, its not safe to ingest! If its not ruby red, its useless.
If its yellow, its not reduced and is still gold chloride which is a neurotoxin.
STOP before you hurt yourself.
Plain vitamin C is an acid, and acids deactivate glucose and maltodextrin. No one here told you to mix them together.
You are too hung up about the precipitate. It doesn't hurt anything. If it did, I would be the first to know since I have probably consumed more of it than anyone in the world.
You can mix colloidal gold and colloidal silver as long as you actually have colloidal gold, which you apparently do not.
Forget about Vitamin C. Sodium citrate, maltodextrin, glucose, and dextrin are safe.