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The suppressants produced by Zion could completely eliminate heat and rut during that period, making those who took them feel as if they had transformed into betas—pheromones from others would have no influence on their subconscious. More importantly, there were absolutely no side effects. This was due to a substance derived from the 'deep fear' liquid of scent glands, which manipulated the brain to activate defense mechanisms that temporarily shut down the mating instinct. This instinct would easily return once the certain nerves in the brain return to normal. Of course, there were other chemicals recipe that only Zion knew how to produce—limited materials that made his suppressants extremely expensive and produced in very small quantities, with only a few important soldiers in IHPS receiving them for free (usually, these soldiers were also victims of Zion himself).