Took this as soon as I started having symptoms of Covid-19 along with some other supplements. I was better in 3 days, improvement the next day. My son also took it and didn’t get sick. Very nice taste and quality ingredients. I always have this in the cupboard for emergencies, won’t be without it.
This appears to be a perfectly satisfactory elderberry syrup product. I was concerned that the added vitamin c and zinc would set off my synthetic vitamin and mineral intolerance (a headache the following day that lasts all day), but that didn't happen, so that's a plus for Zarbee's BEIS syrup. But it has significantly more sugar than other equivalent products at iHerb, and as I'm a type 2 diabetic who is controlling their blood sugar levels with diet and oral medicines, that's a negative for this product. So I'm just taking half the daily dosage I would normally take. Even though it has a very good price, I'll probably only buy Zarbee's Black Elderberry Immune Support syrup on this site when no other reasonably priced alternatives are available.
We've tried three brands and this is the best so far. The first tasted great but was the most expensive. The next had no sugar (was glycerol based) but tasted bad. Hubby likes this one as well as the first one, and I like this one because it costs a dollar less! There's no way of testing for effectiveness, tho, so we can only go on taste and price