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What is boldenone undecylenate? Boldenone undecylenate is a synthetic derivative of testosterone modified by the addition of a double bond between carbon atoms 1 and 2, which significantly reduces aromatization and estrogen-related side effects. Initially developed for veterinary purposes to improve appetite and muscle tone in animals, it later gained popularity in sports as a long-acting anabolic compound known for stable, high-quality muscle growth without excessive water retention. The und..