Double Wood Supplements is an American nutritional supplement company founded in 2013 by twin brothers Reese and Evan Wood. The company originally developed from the founders' interest in nootropics and specialized nutritional ingredients, before expanding into a broad range of supplements designed for different health and wellness needs.

A central part of Double Wood's philosophy is transparency, quality, and straightforward formulations. The company places particular emphasis on single-ingredient supplements, allowing consumers to clearly understand which ingredient they are taking and in what amount. Its portfolio also includes a variety of specialized and less commonly available ingredients used in products targeting areas such as cognitive wellness, healthy aging, and general nutritional support.

Particular emphasis is placed on quality control and laboratory testing. According to the company, every Double Wood supplement undergoes independent third-party testing, including verification of ingredient identity, potency, and purity. Products are also tested for contaminants such as heavy metals and microbiological agents, while Certificates of Analysis (COAs) are made available for its supplements.