This site states its own reasoning directly: sublingual application is chosen for quick, simple daily use without capsules or powders.
Worth reading "quick" and "simple" as the two stated priorities behind this format choice — convenience and ease of daily use, rather than any specific claim about absorption speed or potency advantage over capsules.
This site separately lists "prefer a simple daily spray over pills or powders" among its reasonable-fit points — worth reading that fit criterion as directly following from this stated format reasoning.
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