The first is because it is broken down in the digestive system and liver, so only a small amount of it is absorbed intact into the bloodstream
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Under a doctor's care, this therapy is considered safe for long-term use
From a research perspective, neither format can be described as better, as oral capsules and injectable formats work for different experimental purposes
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A peptide also cannot overcome ongoing overtraining, poor nutrition, uncontrolled blood sugar, untreated thyroid dysfunction, low testosterone when clinically relevant, vitamin or mineral deficiencies, or inadequate rest