Hi, thanks for your question! Being on an HCG weight loss diet usually doesn’t directly interfere with dermal fillers like those for the chin. The filler works in the soft tissue and isn’t affected by the HCG hormone itself. That said, rapid weight changes—especially if you’re losing weight quickly—can sometimes slightly alter facial fat and skin tension, which can affect how filler looks over time. So while it’s safe to get the procedure, keep in mind that the final appearance might shift a little as your weight changes. Otherwise, there’s no medical reason to avoid filler while on HCG, just be aware of the timing in relation to your weight loss goals.