No- unless with iron
The only ingredient potentially found in gummy vitamins that could cause a lethal overdose
However, most gummy vitamins do not contain iron- i actually searched quite a bit and could not find any. This is likely to prevent overdose problems. And if they did you would have to take a huge amount- a lethal dose is at least 60 mg/kg, so an overdose for a 50 lb person would be about 1400 mg.