Can vitamin b6 helps to reduce uric acid level and kidney stones?

No: Most stones are caused by crystallization of calcium oxalate. The most common antidote is magnesium. Uric acid actually comes from the metabolism of sugar and vitamin b1, which works closely with magnesium would be more likely to help rather than b6. Avoidance of sugar may be a key factor.

No: Medications such as Allopurinol and uloric work best.

Uric acid and diet: Vit B 6 can have a mild benefit - more important: avoid organ meats; fatty meats and alcohol will elevate uric acid. Avoid these. Also, drink at least 3 liters fluid per day - this dilutes uric acid excretion - and incline diet successfully to mostly whole grain, fruit, and veggies, and nuts, using white fish and egg white for protein, then uric acid level will drop;