Menu
Log In Sign Up
Article

why does collagen peptides make me tired due to their high glycine content, which can promote relaxation and sleepiness

Published October Oct 17, 2026 8:22 AM

As someone who has experimented with various wellness routines and dietary supplements, I have often encountered questions about the unexpected effects of collagen peptides. Many people, myself included, have wondered: why does collagen peptides make me tired? After researching the biochemical properties of this protein and observing my own body’s reactions, I have gathered some insights that might help clarify this experience.

The Role of Glycine in Relaxation

The most common explanation for feeling lethargic after consumption is the Jul 9, 2025—Yes, collagen supplements may cause drowsiness in some individualsdue to their high glycine content, which can promote relaxation and sleepiness.Read more high concentration of specific amino acids. Marine collagen peptides contain up to 20% glycine by weight, making them a potent source of this particular nutrient. Because of its high content of the amino acid glycine, which serves as an inhibitory neurotransmitter, it can influence the central nervous system.

For many users, collagen contains glycine, an amino acid that has a relaxing effect on many people. This is often due to their high glycine content, which can promote relaxation and sleepiness. In my experience, taking this supplement in the evening feels different than in the morning, as it seems to help quiet the mind before bed.

Is It Really Fatigue?

It is important to note that for most people, collagen doesn't typically cause fatigue or sleepiness in a negative sense. In fact, many reports suggest that collagen peptides may play a role in improved energy by enhancing recovery. When I integrate collagen into my daily ro Difficulty Swallowing:Collagenbuildup in the esophagus cancreatechallenges in swallowing. Fatigue: Persistent tiredness is common, especially when other Read more utine, I find that it reduces sleep fragmentation, leading to feeling more refreshed the next day rather than just "tired."

It is a common misconception that collagen acts like a sedative. In reality, collagen doesn't act as a Mar 17, 2026—Collagenis a protein needed for bone and skin health. Possible side effects ofcollageninclude stomach upset, allergic reactions,  sedative. Instead, it works more like a structural building block for the body. While some users report a "crash," it is often for individuals sensitive to blood sugar fluctuations where the addition of the supplement into a specific dietary context might cause a shift in energ Jul 8, 2025—A rise in serotonin and melatonin levels could potentially lead to increased feelings of tiredness, especially ifcollagenis consumed at times Read more y levels.

Personal Observations and Nuance

When I look at my own usage, I have found that consistency is key. Collagen helps fight chronic fatigue by supporting overall connective tissue health, but the timing of your intake matters. If you are someone who feels a slight "heaviness" after a scoop, consider these points:

* Amino Acid Balance: There's lots of glycine in collagen, The Close Connection Between Collagen and Sleep and while it is beneficial for sleep, it is not meant to be a stimulant.

* Biological Variability: Just as one person might find a supplement energizing, another might find it calming. The body’s unique response to collagen peptide intake is highly individual.

* Recovery Support: I have noticed that on days following heavy physical activity, my body seems to crave the amino acids found in these supplements to create better recovery conditions.

Conclusion

If you find yourself asking why you feel a bit sleepy after your morning shake, re The Close Connection Between Collagen and Sleep member that Collagen's amino acids can help improve sleep hygiene. Rather than viewing the sensation as a side effect, I have started to view it as a signal that my body is benefiting from the restorative properties of the protein. Whether you use collagen peptides for skin elasticity or joint support, the key is listening to your body’s signals. If it makes you feel calm, perhaps that is exactly what your system needs at that moment. As with any addition to your routine, observing your own patterns—independent of anecdotal reports—is the best way to determine how this s Nov 8, 2024—4. Will collagen make me sleepy during the day? No,collagen doesn't act as a sedative. Instead, it helps your body regulate sleep patterns Read more upplement fits into your lifestyle.

Leave a Comment
Get new articles in your inbox

News, updates and freebies. No spam, unsubscribe anytime.