Modern food and beverage preservatives range from being generally unhealthy to those with suspicions of being dangerous. Through the progression of food and health sciences many preservatives used in the past have now been banned for their known danger. Common preservatives include Benzoates, Sorbates – including potassium sorbate, Propionates, Nitrites and Sulfites.
None of these can reasonably be considered natural and many have known allergy and health issues. All of stoaks preservative extracts are natural and organic and a far more healthy alternative to commercial grade agents.