I recently added Now products - Soy Lecithin Granules to my morning smoothie (2 scoops) and I am feeling the difference. Seems to help with my energy and a noticeable increase in semen volume. Also my cholesterol levels have improved somewhat. I wasn't aware that sunflower seed lecithin was preferred over soy lecithin until I did a search on this forum. When this bottle finishes I will make the switch. I was just curious if anyone is using soy lecithin with good results.