Iron

What it does

Iron is the mineral that lets your blood carry oxygen to every cell, so when it runs low, the first sign is usually fatigue, breathlessness, or feeling cold. It's one of the most common deficiencies in menstruating women. We use the bisglycinate form, which delivers the energy benefits of iron without the constipation that classic iron pills are known for.

The science

Iron enables haemoglobin synthesis and oxygen transport. Deficiency causes fatigue, cognitive impairment, and is the world's most common nutritional deficiency.

Most relevant for

Menstruating women, plant-based eaters, and unexplained tiredness. Only supplement iron if you're low; test first.

Key references

• Examine.com: Iron — research summary
• MyStaq Clinical Elements Library