Blood sugar supplements come as liquids, capsules and powders; here is the general trade-off.
A capsule is pre-measured and tasteless to swallow. A liquid lets you measure each serving and mix it into a drink, at the cost of handling a dropper and any taste.
This site positions its dropper as easy to mix into a routine with no capsules to swallow. It makes no claim that a liquid is stronger than a capsule.