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Standard Timing Protocols: Morning LDN vs Evening LDN
Two dominant timing strategies exist for combining peptides and low dose naltrexone: morning LDN with evening peptide dosing, or evening LDN with late-morning peptide dosing. The evening LDN protocol is more common and better-supported by receptor occupancy da
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- Two dominant timing strategies exist for combining peptides and low dose naltrexone: morning LDN with evening peptide dosing, or evening LDN with late-morning peptide dosing. The evening LDN protocol is more common and better-supported by receptor occupancy data. LDN dosed at 9–10 PM clears by 10 AM–12 PM the following day, allowing peptide administration during the midday window when 6-beta-naltrexol levels drop below receptor-blocking thresholds. This schedule also aligns with LDN's intended immune-modulating effect, which occurs during the overnight endorphin rebound when opioid receptors are temporarily upregulated after antagonist clearance.
- Morning LDN dosing (6–8 AM) creates a longer peptide-free window but disrupts the endorphin rebound mechanism. LDN's therapeutic benefit for autoimmune conditions depends on transient receptor upregulation during the 4–6 hour post-clearance period. That upregulation drives increased endorphin production, which modulates immune cell activity. Dosing LDN in the morning shifts the rebound window to late afternoon, a period when cortisol and catecholamine levels are already elevated, potentially blunting the immune benefit.
- Our team recommends evening LDN (9–11 PM) with peptide administration 11–15 hours later (8 AM–2 PM the next day) as the default peptides and low dose naltrexone LDN synergy timing protocol. This preserves the overnight endorphin rebound, ensures full metabolite clearance before peptide dosing, and aligns peptide administration with natural growth hormone pulses (which peak 1–2 hours post-waking in most adults). Peptides without opioid activity can be dosed at any time. Growth hormone secretagogues are often taken pre-sleep to amplify nocturnal GH release, regardless of LDN timing.