
Helen Keller
Helen Keller International (HKI) supports vitamin A supplementation (VAS) for children in sub‑Saharan Africa. WHO recommends VAS for children aged 6–59 months two to three times per year; evidence shows it reduces child mortality, with GiveWell estimating ~4–12% effects. Delivery is very low‑cost (about US$1 per capsule) and highly cost‑effective (roughly US$1,000–US$8,500 per life saved); HKI is a GiveWell‑recommended Top Charity.
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