A lot of “natural” deodorants use baking (bicarbonate) soda to help combat body odour because it can replace harmful chemicals. Unfortunately it can cause irritation and a rash.
This does not mean that baking soda is bad, it is just to highly concentrated in some products. Baking soda is an alkaline and when mixed with your sweat it can have a reaction that irritates your skin.
Not all people will react the same way the same product, or the same concentration of baking soda. If you do have an adverse reaction, then you can either find a deodorant with a lower concentration of bicarbonate soda or find one with no bicarbonate soda.
At moonwish we clearly state this information in the product description