Then her nutritionist suggested that she check her magnesium levels. It turned out she was deficient in the mineral, so she started doing a nightly magnesium soak, and after 11 days she says she was sleeping for an uninterrupted nine hours. Since 2020 manufacturers such as Nature Made and Garden of Life have expanded their offerings from pills to gummies and powders, and just in the past two years, vitamin retailer GNC has seen sales of magnesium supplements grow over 70%.