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When thinking about whether to donate to Helen Keller International's Vitamin A supplementation program, I wondered whether this is problematic for animal welfare, since Vit A is usually derived from animal sources as I understand it. So I asked HKI and they said their Vit A is chemically synthesised without animal origin, though their capsules do contain gelatin sourced from cattle. My perception is that the use of gelatin wouldn't be expected to contribute a lot to animal welfare problems (though it might matter for people who never want to fund purchasing of animal products). I just thought I'd share this in case anyone else wondered.