What supplements should I avoid if I have high potassium?

What Supplements to Avoid If You Have High Potassium

If you're managing high potassium levels, it's not just your diet you need to watch—some herbal supplements can also pose a risk. While natural doesn’t always mean safe, many people overlook the potential dangers of herbal remedies, especially when it comes to minerals like potassium.

Milkweed, lily of the valley, Siberian ginseng, and hawthorn berries are among the herbal supplements that may increase potassium levels. These ingredients, often marketed for heart health or energy, can interfere with electrolyte balance and worsen hyperkalemia—especially in people with kidney issues or those on certain medications like ACE inhibitors or potassium-sparing diuretics.

Other less obvious culprits include noni juice, alfalfa, dandelion, horsetail, and nettle. These are commonly found in “detox” blends or general wellness tonics, but they have mild diuretic or mineral-rich properties that can elevate potassium. For instance, dandelion root is a natural potassium-sparing diuretic—great for some, dangerous for others.

Even more concerning are preparations made from dried toad skin—known in traditional medicine as Bufo, Chan’su, or Senso. These contain toxic compounds that affect heart rhythm and can dangerously boost potassium levels. They’re sometimes found in unregulated supplements and should be strictly avoided.

The bottom line? Just because a product is labeled “natural” doesn’t mean it’s safe for everyone. Always check with your healthcare provider before starting any supplement—especially if you have kidney disease, heart conditions, or are on medications that affect potassium. A quick review of ingredients could prevent a trip to the emergency room.