I just got a fruit salad from a bagel place that lists 'calcium ascorbate' as an ingredient (on plain fruit? really?) Whaat?
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HalfPint is a trusted home cook.
It's to keep the fruit from turning brown quickly. it's the calcium salt of ascorbic acid (vitamin C).
....so it serve the same purpose as squeezing lemon juice on the fruit -- no harm done.
To go a little further, calcium ascorbate is actually a form of Vitamin C so it's outright good for you, providing not only the vitamin but a good dose of calcium as well. This is a great example of how many ingredients with funny names are not the monsters we've been told we must fear.