Is there any evidence that synthetic folic acid is sprayed on crops on newly picked crops to add shelf life to vegetables?

“Folic acid is sprayed on crops to extend shelf life” is not a real practice, and no evidence retrieved supports it. The retrieved records contain exactly one study, and it is about encapsulating 5-MTHF (the active form of folate) in a pectin-alginate matrix to protect it during food processing like extrusion [1]. That is a food-fortification technique, not a post-harvest spray on vegetables. The study measured folic acid retention in soymilk, milk, and starch-water under boiling and autoclave conditions [1]. It says nothing about spraying anything on crops, nothing about shelf life, and nothing about synthetic folic acid being applied to fresh produce.

The claim likely confuses two separate things. One is folic acid fortification of processed foods (flour, cereals), which is real and regulated. The other is post-harvest treatments like waxes, fungicides, or chlorine washes, which are used on some produce but do not include folic acid. There is no mechanism by which spraying folic acid would extend shelf life. Folic acid is a vitamin, not a preservative. It does not inhibit microbial growth, slow enzymatic browning, or reduce water loss. If anything, adding moisture to freshly picked produce would accelerate spoilage, not delay it.

The evidence base for this specific question is empty. The one retrieved record [1] is about encapsulation during processing, not crop spraying. No study, no industry standard, no regulatory document supports the practice. The burden of proof is on the claim, and the claim has nothing behind it.

Confidence: high that the practice does not exist. The question is answerable only in the negative, and the negative is supported by the total absence of any record describing such a practice.