Biological Heart Valves. Biological Heart Valves are made of tissues and valves derived from animals or human donors. Their biggest advantage is that they do not cause blood clotting on their surface and truly replicate the form and function of the normal human valve.
The biggest difference between cured and uncured is the fact that the uncured uses natural curing agents, such as celery powder, which transforms into nitrite when it is processed. Thus, uncured products have labels with: âNo Nitrates or Nitrites added except those naturally in celery powder or juiceâ.
Turns out most uncured meats still have nitrates/nitrites in themâthey just come from a natural source like celery powder. Theyâre labeled âuncuredâ and âno nitrates or nitrites addedâ because thatâs what USDA labeling laws require when naturally sourced nitrates/nitrites are used. According to a 2011 study, uncured meats may contain just as many nitrates/nitrites, if not more, than conventional meats.