As a **specialist in the field of botany and toxicology**, I can provide a comprehensive answer to your question regarding the potential toxicity of lemon seeds to humans. Firstly, it's important to understand that many plants contain compounds that can be toxic if ingested in large quantities. This is a natural defense mechanism that plants have evolved to deter herbivores from consuming them. However, the presence of these compounds does not automatically mean that the plant or its parts are poisonous to humans. Lemon seeds, specifically, contain a compound known as limonin. Limonin is a type of glycoside which is found in citrus seeds and peels. While it is true that some glycosides can be toxic, the toxicity of limonin is not well-established in humans. It is worth noting that the concentration of limonin in lemon seeds is relatively low compared to other parts of the citrus fruit where it is found. The statement that lemon seeds contain a form of cyanide is not entirely accurate. Cyanide is a highly toxic chemical compound that can be lethal in very small amounts. While some plants do produce cyanogenic glycosides, which can release cyanide upon breakdown, lemon seeds are not known to contain these compounds. The confusion may arise from the fact that certain other members of the Rutaceae family, which lemons belong to, do produce cyanogenic glycosides, but lemons themselves are not among them. Regarding the ASPCA's statement, it is true that lemon seeds are not considered poisonous for dogs. However, as with humans, they can potentially cause digestive issues due to the presence of limonin and other compounds found in the seeds. It's always best to err on the side of caution and avoid feeding lemon seeds to pets. In conclusion, while lemon seeds do contain compounds that can be harmful if ingested in large quantities, they are not considered dangerous to humans under normal circumstances. It is always safe to remove seeds before consuming lemons to avoid any potential discomfort or digestive issues. However, if you were to accidentally ingest a lemon seed, it is highly unlikely to cause any serious harm. read more >>

They contain a form of cyanide, a substance lethal to humans. But lemons are not in the same family as these fruits; lemon seeds are not considered dangerous. ... The ASPCA says lemon seeds are not poisonous for dogs to consume, although they could also possibly cause digestive problems for canines.read more >>