Glycine reviews: what real users say
We read 695 first-hand mentions of Glycine from health and supplement communities. 299 of them say clearly how it went — and 70% of those say it helped.
Where people say it works: sleep (87% of 255), anxiety (78% of 60), mood (87% of 39), energy (94% of 17).
Most common complaints: vivid dreams, drowsiness, fatigue, brain fog, tolerance. All side effects →
Positive experiences
“2 grams with 200mg magnesium before bed gives me crazy good sleep. Crazy vivid dreams.”
“I saw a research...combining magnesium and potassium before bed. I added in glycine to the mix. After that I started to sleep 4 hours then 5 then 6. Now I'm at 6-7 hours.”
“I take 5 grams of straight glycine before bed, and for me it made a big difference.”
“NAC is actually wildly effective. I felt it within the first few hours and holds until the next dose. Supplementing with Glycine to get the GlyNAC duo. Glycine has been doing absolute wonders for my sleep.”
“I cannot stress how much glycine has changed my life. But there's one more crucial component: P5P (active vitamin B6). Individually, neither glycine nor P5P do much for my anxiety or alcohol cravings, but together, they made me feel well.”
“I discovered glycine promotes these stages of sleep that I was missing. Now I have almost completely managed to control it with high doses of glycine (15g, twice nightly, 30g total).”
Negative and mixed experiences
“Taking isolated glycine several days in a row makes me super groggy throughout the day. It puts me to sleep almost like a sedative.”
“I've been taking about 4.5 grams of glycine about an hour before bedtime to benefit sleep (the evidence on this seems relatively strong).”
“Someone on Reddit recommended 5000 mg of glycine a few hours before bed. Although not perfect, my score is now in the 70s and deep sleep is 45-60 min.”
“I take a lot of glycine...I take a couple of teaspoons of the powder every night and it helps me sleep without any sort of payback.”
“I tried using glycine as a sleep aid for a while and it did the opposite. Turns out it's stimulating for some people and sedating for others.”
“Glycine works REALLY good for me for sleep, but the way i get it is in the form of collagen peptides, or just gelatin. That way you get all the other amino acids as well, it knocks me out and my sleep is very deep.”
Quotes are verbatim and link to the original public discussion. Information only — not medical advice. How we collect reports