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The reasons: Receptor sensitivity: While GHK-Cu doesn't appear to cause receptor downregulation the way some peptides do, cycling is a general precaution to maintain responsiveness and avoid adaptations that might blunt benefits
doi:10.1016/j.fertnstert.2014.12.104
Does Retatrutide Cause Muscle Loss as a Side Effect
It has been observed that a deficiency of vitamin D and calcium is common in PWS, with the possibility of an additional risk of vitamin D deficiency if a person is obese
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