In reality, ‘natural’ products are usually more chemically complicated than anything we can create in the lab. To demonstrate, I broke down the components in an ordinary banana. (For brevity’s sake, I omitted the thousands of minority ingredients, including DNA.) Here is the result:
WATER (75%), SUGARS (12%) (GLUCOSE (48%), FRUCTOSE (40%), SUCROSE (2%), MALTOSE (<1%)), STARCH (5%), FIBRE E460 (3%), AMINO ACIDS (<1%) (GLUTAMIC ACID (19%), ASPARTIC ACID (16%), HISTIDINE (11%), LEUCINE (7%), LYSINE (5%), PHENYLALANINE (4%), ARGININE (4%), VALINE (4%), ALANINE (4%), SERINE (4%), GLYCINE (3%), THREONINE (3%), ISOLEUCINE (3%), PROLINE (3%), TRYPTOPHAN (1%), CYSTINE (1%), TYROSINE (1%), METHIONINE (1%)), FATTY ACIDS (1%) (PALMITIC ACID (30%), OMEGA-6 FATTY ACID: LINOLEIC ACID (14%), OMEGA-3 FATTY ACID: LINOLENIC ACID (8%), OLEIC ACID (7%), PALMITOLEIC ACID (3%), STEARIC ACID (2%), LAURIC ACID (1%), MYRISTIC ACID (1%), CAPRIC ACID (<1%)), ASH (<1%), PHYTOSTEROLS, E515, OXALIC ACID, E300, E306 (TOCOPHEROL), PHYLLOQUINONE, THIAMIN, COLOURS (YELLOW-ORANGE E101 (RIBOFLAVIN), YELLOW-BROWN E160a), FLAVOURS (3-METHYLBUT-1-YL ETHANOATE, 2-METHYLBUTYL ETHANOATE, 2-METHYLPROPAN-1-OL, 3-METHYLBUTYL-1-OL, 2-HYDROXY-3-METHYLETHYL BUTANOATE, 3-METHYLBUTANAL, ETHYL HEXANOATE, ETHYL BUTANOATE, PENTYL ACETATE), 1510, NATURAL RIPENING AGENT (ETHENE GAS).
This exercise illustrates a larger point. The distinction between natural and synthetic chemicals is not merely ambiguous, it is non-existent. The fact that an ingredient is synthetic does not automatically make it dangerous, and the fact that it is natural doesn’t make it safe. Botulinum, produced by bacteria that grow in honey, is more than 1.3 billion times as toxic as lead and is the reason why infants should never eat honey. A cup of apple seeds contains enough natural cyanide to kill an adult human. Natural chemicals can be beneficial, neutral or harmful depending on the dosage and on how they are used, just like synthetic chemicals. Whether a chemical is ‘natural’ should never be a factor when assessing its safety.
I strongly suggest reading the whole thing, it’s not super long!