Glycine vs Taurine
Both are used for live longer. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Glycine | Taurine | |
|---|---|---|
| Human evidence | ★★★☆☆ | ★★★☆☆ |
| Legal status | OTC Supplement | OTC Supplement |
| How it works | Smallest amino acid; inhibitory neurotransmitter at spinal/brainstem glycine receptors (GLRA1), lowers core body temperature (a sleep-onset trigger) via peripheral vasodilation, and supplies one-third of collagen's amino acids. Mimics some… | Conditionally essential amino acid concentrating in heart and muscle; stabilises membranes, regulates intracellular calcium handling, is an antioxidant, and acts as a weak GABA-A agonist. A 2023 Science study found taurine declines with… |
| In plain English | An amino acid that gently cools you down and quiets the nervous system for sleep, and is the main brick in collagen. Dirt cheap, very safe. | An amino acid that keeps heart and muscle cells stable and calm. Its levels fall as you age; topping it up extended healthy lifespan in animals and is cheap and safe in humans. |
| Bottom line | One of the most undervalued supplements — sleep + connective tissue + longevity. | Low-risk, promising longevity and endurance support. |
| Availability | Available over the counter | Available over the counter |
Which is better for live longer?
We do not publish an indication-specific evidence grade for Glycine or Taurine for live longer, so we are not going to name a winner. The star ratings shown below are whole-compound summaries across everything each has been studied for — they are not a grade for this use, and comparing them here would be misleading. What actually differs is mechanism, side-effect profile, interactions, availability and cost. Those are compared in full below.
Common questions
Is Glycine or Taurine better for live longer?
We do not publish an indication-specific evidence grade for Glycine or Taurine for live longer, so we are not going to name a winner. The star ratings shown below are whole-compound summaries across everything each has been studied for — they are not a grade for this use, and comparing them here would be misleading. What actually differs is mechanism, side-effect profile, interactions, availability and cost. Those are compared in full below.
What's the difference between Glycine and Taurine?
Glycine: One of the most undervalued supplements — sleep + connective tissue + longevity. — Taurine: Low-risk, promising longevity and endurance support.