The vitamin is found in the germ and aleurone layer of grains, so there is more in whole wheat bread compared to white bread wheat, and more in brown rice compared to white rice.Most values shown in the table are rounded to nearest tenth of a milligram:

Fortification
As of 2019, fourteen countries require food fortification of wheat flour, maize flour or rice with vitamin B6 as pyridoxine hydrochloride. Most of these are in southeast Africa or Central America. The amounts stipulated range from 3.0 to 6.5 mg/kg. An additional seven countries, including India, have a voluntary fortification program. India stipulates 2.0 mg/kg. Dietary supplements
In the US, multi-vitamin/mineral products typically contain 2 to 4 mg of vitamin B6 per daily serving as pyridoxine hydrochloride, but a few contain more than 25 mg. Many US dietary supplement companies also market a B6-only dietary supplement with 100 mg per daily serving. While the US National Academy of Medicine sets an adult safety UL at 100 mg/day, the European Food Safety Authority sets its UL at 25 mg/day. Health claims
The Japanese Ministry of Health, Labour, and Welfare (MHLW) set up the Foods for Specified Health Uses (特定保健用食品; FOSHU) regulatory system in 1991 to individually approve the statements made on food labels concerning the effects of foods on the human body. The regulatory range of FOSHU was later broadened to allow for the certification of capsules and tablets.
Using Arabidopsis thaliana (common name: thale cress), researchers demonstrated that UV-B exposure increased pyridoxine biosynthesis, but in a mutant variety, pyridoxine biosynthesis capacity was not inducible, and as a consequence, ROS levels, lipid peroxidation, and cell proteins associated with tissue damage were all elevated. Biosynthesis of chlorophyll depends on aminolevulinic acid synthase, a PLP-dependent enzyme that uses succinyl-CoA and glycine to generate aminolevulinic acid, a chlorophyll precursor. In addition, plant mutants with severely limited capacity to synthesize vitamin B6 have stunted root growth, because synthesis of plant hormones such as auxin require the vitamin as an enzyme cofactor. Medical uses
Isoniazid is an antibiotic used for the treatment of tuberculosis. Common side effect include numbness in the hands and feet, also known as peripheral neuropathy. Co-treatment with vitamin B6 alleviates the numbness.Overconsumption of seeds from Ginkgo biloba can deplete vitamin B6, because the ginkgotoxin is an anti-vitamin (vitamin antagonist). Symptoms include vomiting and generalized convulsions. Ginkgo seed poisoning can be treated with vitamin B6. Dietary recommendations
The US National Academy of Medicine updated Dietary Reference Intakes for many vitamins in 1998. Recommended Dietary Allowances (RDAs), expressed as milligrams per day, increase with age from 1.2 to 1.5 mg/day for women and from 1.3 to 1.7 mg/day for men. The RDA for pregnancy is 1.9 mg/day, for lactation, 2.0 mg/day. For children ages 1–13 years the RDA increases with age from 0.5 to 1.0 mg/day. As for safety, Tolerable upper intake levels (ULs) for vitamins and minerals are identified when evidence is sufficient.