These product works by stimulating the pituitary gland to produce more HGH in your body naturally without injection. Sprays will be more effective for people in their 30's for the simple reason that a younger pituitary gland responds better to stimulation. Stimulants will produce some increase HGH levels for older individuals but will not produce the optimal levels that an injectable prescription strength of hGH would do. As people get older (over age 35), the stimulant product becomes a less attractive and injectable HGH becomes a much better option.
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