Yes. It is pressed from black mustard seeds and nothing else. Mustard is one of the allergens that must be declared in the UK, so anyone with a mustard allergy should avoid it. The facility note about wheat, seeds and nuts is a separate matter.

Black mustard seed contains compounds that produce that pungency when the seed is crushed. Cold pressing leaves them intact, where refining strips them out. The sharpness is a sign of an unrefined oil rather than anything wrong with the bottle.

Glyphosate is a widely used herbicide, and residues turn up in many conventionally grown crops. This oil is independently tested and certified free of it, which is a specific, verified claim rather than a general statement about farming practice.

The oil passes through one filtration rather than the multiple refining stages used for supermarket oils. It stays closer to how it came out of the press, which is why the colour is deeper and the aroma stronger than a refined equivalent.

Because it is filtered once rather than refined. Fine particles from the seed settle over time and the oil can cloud in a cold kitchen. Neither affects the oil — turn the bottle gently before pouring and it evens out.