One can indeed brew love in a bottle
The love potion set comes with two vials. One is for the intended lovee, and one for the lover. The lovee must drink their potion first, and will be emitting pheromones detectable by the lover. The lover, after drinking the potion, will detect the pheromones (if the lovee is nearby of course, such as in the same room) and undergo a permanent neural rewiring, making them feel a strong overwhelming sense of love, devotion, physical and psychological attraction towards the lovee.
Any previous sexual or romantic commitment (or lack of any commitment) will seem like a distant memory from another life.
Even if the lover is aware of the artificial nature of the potion effect, this does not diminish the strength of the effect.
The effect is permanent, insofar as it generates the same changes to the brain as falling very hard for someone naturally would. That does not mean the love will last forever, unless of course the ensuing relationship is of such a nature as to make that happen, or the two agree to take another dose.
The potion only works one way (Lover A falls in love with lovee B, if you want B to also fall in love with A you need two sets of potions)
The potential for misuse is there and glaring (Many would want to get Mr. or Mrs. Perfect to love them with unremitting devotion, and only them, and others yet would use the one-way devoted love for dark nefarious purposes) so the main idea is that I want to devise a way to make the potion only work among two consenting adults.
Both must make a free, conscious and clear-minded decision before the vials are opened. How could these potions be regulated (or perhaps the bottles modified) such that that is the only possible activation pathway?
Edit: I am surprised I have to say this, since magic was never mentioned above, only brain chemistry, but I see no magic being involved in the first place. In either the potion or the usage-restrictions. Strictly non-magical.