How should this collagen be taken, and what is it better not to combine it with?

The exact dosage and regimen are given by the manufacturer on the packaging, so follow those recommendations. Liquid collagen is usually taken once a day; some people prefer to take it in the morning on an empty stomach, others with a meal. It makes no fundamental difference: regularity matters more.

The vitamin C in the formula helps the absorption of iron from plant sources, so if you take iron supplements separately, it is worth bearing this in mind when planning your intake. Collagen peptides go well with a protein-rich diet, but they do not replace a balanced diet.

Retinol calls for particular attention: vitamin A accumulates in the body, and an excess of it is undesirable. If you already take multivitamins, fish oil or other supplements containing vitamin A, discuss the total amount with a doctor or pharmacist. The same applies to use during pregnancy and breastfeeding: during this period any supplement containing retinol requires a specialist's advice.

The product contains fish ingredients, which is important to bear in mind if you have an allergy or sensitivity to fish and seafood. After opening, keep it in the fridge and use it within the period stated on the packaging.