Are you Familiar with Scott Cunningham? He has a book called Incense, Oils, and Brews. It has some tea type brews.
Oh! Why, it would appear that your definition of a Potion is one that is imbibed, that leads to a psychological, physical, or medical action! Myself, on the other hand, why I have been brewing potions for many years--and I will be finishing my monograph on the subject--believe that a potion is, to quote Laurie Cabot, "an organic perfume"--meaning they are to be worn onto the skin, rather than ingested--that affects a change to our reality by the catalyzed energy of the herbs, which are decocted and suspended into the menstruum, such as water or a carrier oil. (Please do NOT confuse that with "aromatherapy!) However, in remote antiquity a potion was chiefly an entheogen (and I cover this in-depth in my chapter on the history of potions!); even love potions were crafted to get a lover high or to dose them with an aphrodisiac in order to make them more "willing" to seduction.
The first potion I ever brewed was a Protection Potion that included, among other ingredients, ground frankincense, myrrh, and benzoin resins brewed in 8 oz. of water with a tablespoon of sea salt. The sea salt has a few other functions: it preserves the potion; it increases the amount of time that I can simmer the ingredients without coming to the boil; and it augments and sustains the electrical charge of the ingredients that I have added to the potion. The most recent formula I created was one I call Fast Luck. Albeit's an incense, it can also be configured and brewed into a water-based or oil-based potion. To a mixture of ground frankincense with a bit white sandalwood powder I added several drops of lemongrass oil, and a few drops each of galangal root oil and sandalwood oil.
You see, the method I have devised for crafting potions is to determine what I want the potion to magically accomplish. If one desires a potion for love, well there are many types of love to be considered so it would behoove us to narrow it down! When I crafted my Protection Potion, for instance, I chose one herb or resin that could do each of the following: neutralize, bind (in a magical sense), vanquish spirits, and one that is a counter-magick herb. I then charge each herb for that specific energy and, as my potion simmers for a few minutes I catalyze the ingredients so that they harmoniously work together as a whole. It may not be your method or what you are particularly interested in, but it is what I have found most affective and taken an immeasurable sense of joy from. :)
Your definition of a potion would be helpful in answering your question.
good catch xD
I know mint, like in gum, helps soothe headaches by increasing blood flow, since a lot of headaches are caused by blood flow restriction. (Small amounts of diluted topical caffeine has the same effect, but I don't know the recipe and it sounds dangerous if done wrong). Chamomile infusion for sleep, of course, usually packaged as 'tea' but not containing any of the tea plant as the latter contains caffeine. Tea itself helps with prolonged concentration, due to the interaction between caffeine and tannins. Coffee, lacking the tannins, does more in the way of raising metabolic rates temporarily (for most people). Ginger helps soothe the stomach, as can carbonation, but most store ginger ale has irritants in their ingredients that limit its soothing effects. Electrolytes (table salt, leafy greens, etc.) and water aid endurance by replacing the various body salts lost when sweating. Vegetable fats aid in muscle growth and repair if I remember correctly. Anything citrus helps the immune system, through vitamin C, fruit sugar, fibre, and other chemistry. Muscle cramps can be eased by eating bananas and/or peanuts (as well as other foods, but those are the top two) due to their high potassium. Dark green vegetables aid night vision over time, though I forget how it works. Similarly, I know spicy foods with capsaicin are good for the heart, but forgot why. Topical aloe is good for soothing irritated skin if said skin is unbroken, and might aid healing if consumed, but I have no evidence for the latter. Fish oil may help brain function, but the research on that is a bit suspect. The act of chewing aids wakefulness, but that's just biology, not potions. Removing heat from sunburns, especially with aloe and/or Vitamin E, if they're overly warm to the touch can prevent further tissue damage.
The only combination brews I know are what I use cooking, that rely on either the above, or personal associations (that I mostly make up) rather than repeatable inherent effects.
Pardon my long-windedness, and if that's not what was meant by potions. I just dug through my memory for herbal knowledge. I'm curious to see what others have to say on the topic, even should the original poster not see the replies. :)