I don’t know anything about inositol, but glycine is just an amino acid. So yes, has calories and would technically break your fast.
Having said that, I’d keep taking them if they help. We still have no idea what the effects are of such small amounts of calories during a fast. When you look at the successful benefits of multiple kinds of low cal fasts like Longo’s FMD, or that german style fasting, Buchinger Wilhelmi, you see dramatic improvements on all kinds of biomarkers and yet they don’t even go all the way to 0 calories.
I’m skeptical that our bodies are so inept that taking in 20 calories shuts down all the good processes. In our distant past when we lived in times of scarcity, a hungry person would have eaten anything they came across. A small handful of berries, a mouse, some edible greens they came across.
The one caveat here would be if you are doing a fast specifically for gut health. In that case I’d avoid everything except water. But if you are fasting for weight, general health reasons, or even autophagy, I think these small bits of calories are fine.