Products that are natural, and nearly natural, those that I craft, are a bit more sensitive to heat and cold. Why? They do not contain additives that hold the product at the same consistency regardless of temperature.
Take goat milk lotion, for example, if the lotion itself heats up to 100 degrees it will become slightly thinner. Once the lotion returns to room temperature (75-80 degrees) it returns to its normal consistency, creamy, not too thick, definitely not thin.
Do not leave the goat milk lotion in your car. The temperatures in a car are far too extreme for a natural product.
Upon arrival, during the warmer months (and extreme cold), allow a lotion or cream type of product to reach room temperature once you receive it in shipment. You will shortly find a product in its natural state, as it should be.
A natural bar of soap also comes with special care. You know, you probably can set a bar of Zest (sorry folks) on a bathroom shelf indefinitely. It would not matter if the temperature was 101 degrees, nor would the humidity at 98 % make a difference, the soap would not sweat. Some natural bars will sweat. Keep this in mind if you do not have air conditioning to regulate the temperature and humidity. A bar that fits into this example perfectly is my spa salt bar. I have seen a salt bar sweat in my bathroom, before we cranked up the A/C! I have no problems with my soap melting, unless it is sitting in a puddle of water. If the soap is made from inexpensive melt and pour bases (not the method that I use), you may experience problems with soap melting away in higher temperatures.
Use your best judgment…I would not say the products are perishable, but use good judgment with their storage. They do not require kid gloves, but they do require a tiny bit of TLC when it comes to storage. A good handcrafted soap or lotion can remain “fresh” for at least a year, and honestly, I have some for my own personal use that are older.
By the way, I cut the bars of soaps (in the photo) today. They are swirled (just on top) with a light violet. The color in the photo does the soap no justice…they are interesting and beautiful. They will be a part of the “25” soaps that I carry, lilac goat milk soap is on that list.