Do calming amino acids work? A guide to theanine, glycine and taurine

If you’ve ever felt tense, wired or unable to switch off, you’ve probably noticed how quickly it affects your mood and sleep. Many people are now turning to calming amino acids for support. They’re gentle, well researched and often helpful when stress feels like it’s running the show. But how do they actually work? Let’s take a clear, practical look.

What are calming amino acids?

Amino acids are the building blocks of proteins, but a few have specific roles in the nervous system. Theanine, glycine and taurine are three we like to use in supplements because they help promote calm without sedation.

• They work with neurotransmitters that influence stress, alertness and sleep.
• They support a smoother stress response, rather than switching the brain off.
• They can be used alongside lifestyle approaches such as breathwork, consistent sleep routines and nutrition.

Theanine - the calm-focus amino acid

Theanine is naturally found in green tea and is widely studied for its ability to create a calm but alert state. It increases alpha brain waves, which are linked with relaxed concentration.

• Often used for mental tension, overthinking and daytime stress.
• Helps balance the effects of caffeine - no surprise it’s in tea.
• Non-sedating, so it can be used during the day.

Theanine and City Survivor

You’ll find theanine in City Survivor Night Support, paired with magnesium glycinate and L-Taurine. It’s included to support a smoother transition into rest, especially when the mind feels too busy to switch off.

Glycine - simple, soothing and surprisingly effective

Glycine is an amino acid the body uses for many processes, but it also acts as a calming neurotransmitter. Research suggests it helps lower core body temperature at night, which is essential for natural sleep onset.

• Often taken in the evening to support sleep quality.
• Helps the nervous system settle after a busy day.
• Useful when you fall asleep late or wake up feeling unrefreshed.

Taurine - steadying for the nervous system

Taurine supports the GABA system, which is central in calming the brain. It’s also involved in regulating heart rate and the stress response, so it can be helpful when you feel wired, overstimulated or frazzled.

• Supports the body’s natural relaxation pathways.
• Acts as a gentle buffer when stress feels relentless.
• Useful for people who feel on edge or overstimulated.

Should vegetarians or vegans consider taurine?

Taurine is found mainly in animal foods, so plant-based eaters may have lower intakes. The body does produce taurine, but in times of stress the demand can rise. This is one of many reasons people find supplemental taurine helpful.

Do calming amino acids actually work?

For many people, yes - and the research backs this up. Theanine, glycine and taurine each support calming pathways in the brain, and they’re well tolerated. Alongside healthy sleep habits and stress management, they can be a valuable part of a modern toolkit for resilience.

How to use them safely

• Drink tea - rich in theanine - during the day or try supplements which are caffeine free in the evening.
• Use glycine 30-60 minutes before bed.
• Taurine can be taken in the daytime or evening.
• Always check with a healthcare professional if you take medication, are pregnant or have a medical condition.
• City Survivor Night Support is a blend of Magnesium Glycinate (magnesium combined with glycine), L-Theanine and L-Taurine. A safe, gentle relaxation aid.

A final thought

If you feel stressed, wired or restless, calming amino acids offer a simple way to support your nervous system. Start small, pay attention to how you feel and give your body the consistency it needs. Pairing nutrients with better boundaries and proper wind-down time can make a real difference.

For products that contain targeted calming nutrients, you’ll find options in the City Survivor range designed to support sleep, steady energy and resilience throughout busy weeks.