It's important, as mentioned above, to know why you want to decrease B6. If you have a high level, given this is a vitamin that leaves the body fairly quickly, once you decrease it to normal levels it should level off. Rather than alter your diet permanently, therefore, possibly depleting yourself of a nutrient you have to have in order to survive, you can chelate it out by increasing your intake of B12 and Folate. These two other B vitamins are in balance with B6, and taking too much of the other two will lower the levels of B6. But again, it's important to know why you need to lower your B6 intake and for how long if a doctor has recommended it. Do you have B6 neuropathy?
Has your Dr. told you to reduce your B6?
Stop taking any vitamin B6 supplements, including multivitamins, tablets, soft gels and lozenges. Typical names used in place of this vitamin include pyridoxal, pyridoxamine, pyridoxine hydrochloride and pyridoxal-5-phosphate.
Limit your intake of foods with B6, like fortified cereal, bananas, salmon, turkey, chicken, potatoes, spinach and hazelnuts. 1 cup of fortified cereal can contain up to 2.5 mg of pyridoxine. Drink water to help flush excess B6 from the body. This compound is water-soluble, urine is the primary means of excretion. On the average it takes the body between 15 and 25 days to eliminate unused pyridoxine. Drink eight, 8-oz. glasses of water per day as part of a healthy diet.
Do you mean decrease?
It is unusual to come across someone who needs to have less of this vitamin. Have you got nerve damage from taking supplements of B6? You do not need to answer that.
The web link below gives information on the foods that contain high amounts of Vitamin B6 and there are also links within that page to more information with regard to other foods that contain Vitamin B6.
The foods that are high in B6 are:
Sunflower seeds
Pistaschio nuts
Fish
Turkey, chicken
Lean pork
Dried fruit
Beef
Bananas
Avocados
Spinach
Check food labels too.
http://www.healthaliciousness.com/articles/foods-high-in-vitamin-B6.php
Ups my wrong, I read "increase", I'm sorry.
Avoid meat, eggs and dairy
I suggest you ask the doctor who's instructing you to reduce your B6.
You could avoid supplements that contain B6 and limit your intake of foods rich in vitamin B6, such as fortified cereal, bananas, salmon, turkey, chicken, potatoes, spinach and hazelnuts.
http://www.timigustafson.com/wp-content/uploads/2010/01/Vitamin-B6.jpg
https://ods.od.nih.gov/factsheets/VitaminB6-HealthProfessional/
http://www.whfoods.com/genpage.php?tname=nutrient&dbid=108