I was recommended to take astragalus and olive leaf extract due to chronic illness to support my immune system (chronic fatigue syndrome and fibromyalgia). I found my stomach couldn't tolerate these supplements separately so I thought i'd give this a go after seeing they had these things as the active ingredients. I'm so glad I did because these are amazing and don't trigger my IBS at all.
I tend to only take them when I have a cold and my immune system needs an extra helping hand, but my cold symptoms are significantly reduced when I take them and it will only last a few days compared to a few weeks without them (this prevents me have a significant crash and being completely bedridden with the chronic fatigue syndrome). I gave these to my family when they had a cold as well and they were almost completely symptom free later in the day.
I see they have recommended these for chronic fatigue syndrome under the overview, but from my experience these don't boost my energy or relieve my fatigue (I haven't found any supplement that does). But like I said they do prevent me from having a major crash when I'm sick, which makes them well worth it!