You do not need to worry about reaching toxic levels of vitamin D from using SOLIUS! When we spend a day in the sun, we may be concerned about sunburn, but we never worry about overdosing on vitamin D. Incredibly, the body has developed an eloquent and foolproof system for protecting us from getting too much vitamin D when it is synthesized in our skin. In fact, vitamin D production and regulation in the human body are performed only when vitamin D is created in the skin, while vitamin D ingested through the stomach bypasses this essential protection. When the body is exposed to enough UVB light, it will produce the amount of vitamin D the body needs and stop when optimal levels have been reached.