350 = safe upper limit of CO2 in atmosphere. (medium.com)
The use of fatty meats can result in protein deficiencies, especially for puppies and kittens, exceeding safe upper limits for total fat when compared to AAFCO, FEDIAF, NRC, and ancestral standards and pro-inflammatory amounts of omega - 6 fatty acids in chicken foods. (darwinspet.com)
Many vitamin D experts have been lamenting the fact that the current recommended safe upper limit for this nutrient is 2,000 IU per day — well below the 10,000 to 20,000 IU that the skin may naturally generate while a person sunbathes on a summer day. (sciencenews.org)