It is legal if it contains less than 0.3% THC, per the 2018 Farm Bill.
Hemp and marijuana are commonly confused as the same; they are part of the same plant species, Cannabis sativa; yet, they come from different varieties or cultivars. Both are genetically distinct forms of cannabis, distinguished by their use, chemical composition, and differing cultivation practices in their production. Hemp and marijuana also have separate statutory definitions in U.S. law.
While marijuana generally refers to the plant used as a mind-altering drug, hemp produces many products. Some of the products derived from hemp are foods and beverages, nutritional supplements, personal care products, fabrics and textiles, paper, construction materials, and other manufactured and industrial goods.