Positives

• Some patients try high-dose glycine to quiet restlessness, improve sleep, or take the edge off a wired-and-tired state. Reddit.

Negatives

• One patient reported that 3 g of glycine before bed made waking up almost impossible and produced lingering daytime grogginess that didn’t resolve even when the dose was moved earlier into the late afternoon — a complaint many other Long COVID patients trying glycine for sleep echo Phoenix Rising.
• A patient said pure glycine at roughly 1,000 mg triggered a “severe detox reaction” with extreme spaciness and tiredness, and a separate person doing a long-term trial flagged that going beyond 3 g/day brought on mild depressive symptoms — so the supplement that’s pitched as harmless can flatly fail or backfire even at the studied 3 g sleep dose Phoenix Rising.

Hurdles & Side Effects

• A practical challenge is separating pure glycine from magnesium glycinate and other blends, because patients often discover the form matters as much as the ingredient. Reddit.