Reddit reviews Good State Liquid Ionic Lithium Ultra Concentrate (10 drops equals 500 mcg - 100 servings per bottle)
We found 2 Reddit comments about Good State Liquid Ionic Lithium Ultra Concentrate (10 drops equals 500 mcg - 100 servings per bottle). Here are the top ones, ranked by their Reddit score.
Now also available in GLASS BOTTLE! (search "Good State Ionic Lithium Glass Bottle")!Absorbs Much better than Pills!Only 10 Drops equals 500 mcg of Ionic Lithium - 100 Total ServingsProfessional Grade - Natural Lithium - Gluten-Free!Easy to Mix with Juice or Water. Can be taken Sublingually. Comes with Dropper! Small size - Very convenient for travel
Amazon in the U.S. sells both lithium citrate and lithium chloride which I believe is the natural form found in some sources of water.
Edit: Another option for lithium citrate. None of it is cheap, though.
FWIW, they're available on amazon here and here, and they've been used in clinical studies: this (an old study but compared the different forms and found little difference), this, this, this, and this from Googling and PubMeding.