The shampoos that are free of essential oils are made from natural, non-synthetic ingredients. So how can they have a fragrance ?
A fragrance is a blend of aromatic molecules. It doesn't have an action on the skin or the hair; it just gives a scent. Fragrances can be natural or synthetic. Lamazuna products only contain natural fragrances.
An essential oil is extracted from a part of a plant. Each essential oil has one or several properties. When allergens are naturally present in the plant, these allergens will also be found in the essential oil, which is why you may find allergens indicated in the ingredient list.