Taurine

What it is

Taurine is a sulfur-containing amino acid found in high concentration in heart muscle, skeletal muscle, the retina and the brain. Unlike most amino acids it is not built into proteins; it acts instead on calcium handling inside cells, on cell volume and osmotic balance, and forms part of the bile salts. It is taken for physical performance and as a general energy supplement.

A usual adult range, not a national label — the dose and the timing differ by country and by product.

Used for

• Physical performance
• Energy

Approved uses differ by country — some of these may be off-label or unapproved where you live.

What to know while taking it

Meals make no difference to it, so timing is a matter of habit rather than absorption. Its effect on vascular tone and on sympathetic nervous activity means blood pressure can drift downward, which matters where readings already run low or where blood-pressure medication is in use. It is also a standard ingredient in energy drinks and pre-workout mixtures, so the amount arriving from all sources together is easy to underestimate.

When to see a doctor

Lightheadedness on standing, fainting, or blood-pressure readings that fall further than usual are reasons to see a doctor rather than to adjust anything unaided. The same applies when it is being combined with medication that already lowers blood pressure.

Worth knowing

• Can lower blood pressure