Professional Formulas L-Threonine High is a homeopathic formula offering support for nerve health, muscle health, and the immune system. For the temporary relief of minor muscle or joint pain or inflammation, indigestion, irritability, or confusion. Recommended Use: Place drops under tongue 30 minutes before/after meals. Adults and children 12 years and over: Take 10 drops up to 3 times per day. Consult a physician for use in children under 12 years of age.