There is still a fairy high percentage of latent/asymptomatic TB patient develop into chronic TB lung disease later in life. And to prevent passing down TB infection to your family members and people around you it is still advisable to go through a 6-month course of isoniazid. If you have higher risk of liver disease, you can still require a combined drug regimens, i.e., EMB/rifampicin for the first 2-3 months, followed by isoniazid alone or with rifampicin for another 3 months. Studies have shown that this regimen can reduce risks of causing liver injury hepatitis. To make sure you fare well while on these drugs, your doctor usually prescribes pyrazinamide (vitamin B6) simultaneously with drug treatment especially when on isoniazid which can deplete your body store of Vitamin B6. To prevent and manage drug adverse reactions like hepatitis, peripheral neuropathy and increased diabetes risk, you may want to take vitamin D3 1000-1500 IU, plus lipoic acid (5-25 mg) and chromium picolinate (0.2 - 1 mg) daily. Hope this would help.