Coconut oil is unusual among the carriers here because it is not merely a base — it is active in its own right. Roughly half its fat is lauric acid, which has genuine antimicrobial and antifungal properties, and that combination of moisturising and mildly antifungal is rare and useful.
For dry feet it is a straightforward emollient. For dry feet that keep developing fungal trouble between the toes or under a nail, it does both jobs at once, which is why it appears so often in the recipes at the back of the book.
It is solid below about 24°C and liquid above, so it will change state on your shelf through the year. This is normal and does not affect it.
