What it is
L-Threonine is an essential amino acid that the body cannot produce. It serves as a precursor for glycine and serine, important neurotransmitters, and is vital for the synthesis of mucin, a key component of the gut lining.
Supplement · Amino Acid
L-Threonine
500 mg · vegan · gluten-free · 90 caps
brain-fogmemory-lossattention-difficulty braingut
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How it works
L-Threonine is converted in the body to glycine and serine. Glycine acts as an inhibitory neurotransmitter in the central nervous system, while serine is a precursor to other important molecules. Threonine also contributes to the production of mucin, which strengthens the intestinal barrier.
Who should take it
Adults looking to address brain fog, memory decline, attention difficulty. Particularly relevant for people who prefer a targeted single ingredient and who have ruled out an underlying condition that needs medical care first.
Avoid / careful
Pregnant or nursing women without clinician oversight. People on prescription medication affecting the same pathway should consult a doctor before combining. Side effects are uncommon at recommended doses but mild GI upset can occur when starting.
When to take it
Morning
Noon
Evening
Night
How to take it
With food
Empty stomach
Before food
FAQs
Frequently asked
How long does it take to see effects from L-Threonine?
Noticeable cognitive effects are typically observed within 2 to 8 weeks of consistent daily use.
Can L-Threonine help with sleep?
L-Threonine can be converted to glycine, which has calming effects and may indirectly support sleep quality by reducing anxiety and promoting relaxation.
Is L-Threonine safe for long-term use?
At recommended doses, L-Threonine is generally considered safe for long-term use. However, consulting a healthcare provider for personalized advice is always recommended.
Research
6 studies · 2010–2024
Evidence grade
ABCD
C · C · emerging-to-moderate human evidence for brain fog and memory concerns
From the blog
Editorial notes
SacredBod's longer take on L-Threonine — context the structured blocks above don't capture.
About L-Threonine
Essential amino acid for glycine, gut mucin and nerve support.
As part of the Amino Acid category, L-Threonine is included in the SacredBod catalog to support brain fog and memory concerns. See the Mechanism and Research sections above for detail.
Added to your stack.