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There are lots of different reasons for fasting and different reasons mean different answers. Some say any calories at all break a fast, some say less than 50 calories is OK, others will say somethings else. You won’t get a one sized fits all answer.
Personally I fast for insulin levels (and weight loss, but thats related to insulin for me), and anything that causes an insulin response like that would break my fast.
Yes. The sugar will spike your insulin levels and break your fast. But if you absolutely need to take it and don’t mind dirty fasting with a small amount of calories, it’s a personal choice. People dirty fast with success. But if possible, stick to in your eating window.
I take Melatonin (2 gummies = 3g sugar) at night and yes, it does break it. I don’t have a gallbladder and can feel when bile starts generating 10, 15 min after taking it. Usually drink with a glass of water. I need to sleep, so I take my gummies. Still can’t find a gummy melatonin that does not break my fast.