Taurine

Taurine is unusual among amino acids because it is not used to build proteins. It exists free inside cells, at high concentration in heart muscle, skeletal muscle, retina and brain.

It stabilises cell membranes, regulates calcium handling inside cells, and conjugates bile acids so that fat can be emulsified and absorbed. The bile function is the one people rarely know about and the one that connects taurine to fat-soluble vitamin status.

The body synthesises taurine from cysteine using vitamin B6, so synthesis depends on sulphur amino acid supply and on B6 availability.

Below 25 umol/L indicates low taurine. Because it is concentrated in heart and nerve tissue, the functions most affected relate to cardiac rhythm regulation and nervous system stability.

Reduced bile acid conjugation is the less obvious consequence, and it can show up indirectly as poor absorption of fat-soluble vitamins.

Plant-based diets are the common context, since taurine is found almost exclusively in animal foods and synthesis alone often does not keep pace. Impaired sulphur pathways or low B6 are the other route.

Between 25 and 140 umol/L your taurine sits inside the reference range for this panel.

If you eat little or no animal food and your result is in range, synthesis from cysteine is covering the requirement, which depends on adequate protein and B6 continuing to be available.

Above 140 umol/L usually reflects supplementation or a high intake of energy drinks, which are formulated with taurine in gram quantities.

Taurine is well tolerated at the doses commonly used, and excess is excreted by the kidneys rather than accumulated.

A high result matters mainly as information about what else is coming with it. If the source is energy drinks, the caffeine load is the more relevant finding, and worth reading alongside your cortisol result.

Two Western trends pull in opposite directions here. Reduced intake of dark-meat fish and organ meats lowers dietary taurine, while energy drink consumption supplies it in large single doses.

Sulphur pathway strain from poor sleep and oxidative load can reduce synthesis at the same time as intake falls, which is the combination that produces a genuinely low result.

Dark-meat fish such as tuna and mackerel are among the densest sources. Shellfish, particularly scallops and mussels, are also strong.

Poultry, grass-fed meats, eggs and full-fat dairy contribute. There is no meaningful plant source, which is the central difficulty for plant-based diets.

Support the synthesis pathway with sulphur-rich foods such as garlic, onions and cruciferous vegetables, and with adequate methionine from complete proteins.

Taurine at 1 to 3 g daily is the usual range, and it is particularly relevant on plant-based diets where dietary intake is effectively zero.

Vitamin B6 in the P5P form at 25 to 50 mg is a cofactor for synthesis from cysteine, so it addresses the production side rather than the intake side.

Magnesium glycinate at 200 to 400 mg works alongside taurine in cardiac and nervous system function, and the two are commonly taken together.