I’m not an expert on this but here are a few links:
https://www.cambridge.org/core/journals/proceedings-of-the-nutrition-society/article/is-iodine-deficiency-still-a-problem-in-subsaharan-africa-a-review/6C87E944AF05DEE3B7821D986D2F1B77
https://www.givewell.org/international/technical/programs/salt-iodization
https://www.openphilanthropy.org/grants/iodine-global-network-general-support-december-2020/
I’m not an expert on this but here are a few links:
https://www.cambridge.org/core/journals/proceedings-of-the-nutrition-society/article/is-iodine-deficiency-still-a-problem-in-subsaharan-africa-a-review/6C87E944AF05DEE3B7821D986D2F1B77
https://www.givewell.org/international/technical/programs/salt-iodization
https://www.openphilanthropy.org/grants/iodine-global-network-general-support-december-2020/