Hi does anyone know if evening primrose is ok to take when on thyroxine. Obviously about 6 hours later with my vit d. Thanks. Also just had a blood test after being on thyroxine for 6 weeks..results are t4 is 12.5 and the tsh is 3.60. Doctor said all within range and will leave me on 50 until retest in 3 months. Is it usual for the readings to improve so quickly. .suffering with the odd nights of no sleep at all! Wondered if I was heading for an overactive!