Older adults, vegans and vegetarians, and people on long-term acid-reducing medication often run on the lower end of optimal range without obvious symptoms
The complete GHK-Cu dosage guide explains how body weight and treatment goals influence these numbers
The recommendation: remove the vial from refrigeration 15-20 minutes before drawing the dose, or warm the filled syringe in your palm for 60 seconds before injecting

Common reasons Dose too lowif no improvement after 2 weeks at starting dose, consider increasing Poor timinginject 1-2 hours before bed, not right at bedtime or too early Sleep environment issuesDSIP can't overcome a noisy, bright, or uncomfortable bedroom Stimulant use too latecaffeine, nicotine, or screens before bed will fight DSIP's effects Underlying sleep disorderconditions like sleep apnea need medical treatment, not peptides Peptide degradationcheck storage conditions and solution appearance Not enough timegive it at least 2-3 weeks of consistent use before judging Unrealistic expectationsDSIP improves natural sleep, it doesn't induce coma Key Research [1]"Effects of delta-sleep-inducing peptide on 24-hour sleep-wake behaviour in severe chronic insomnia" Schneider-Helmert D, 1987 Finding: In chronic insomniacs, DSIP substantially improved night sleep from the first dose and continued improving with repeated treatment

When used with oral contraceptives B6 may reduce their effectiveness and cause nausea (31)
pmid:7599336 32