The 5 Character Strengths That Most Boost Happiness, Research Finds

There are 24 classic character strengths, kindness, curiosity, bravery, gratitude, and many more, that positive psychology says we can deliberately grow. That is a lot of options. If you only had the energy to cultivate a few of them, which ones actually move the needle on happiness? A sweeping review of the evidence went looking for an answer.

What the researchers wanted to know

Research on mental health increasingly advocates cultivating character strengths as a way to enhance well-being, and a growing number of randomized controlled trials have tested programs designed to do just that. The researchers wanted to map and synthesize all of this evidence to answer a practical question: across the full body of trials, which strengths-building interventions genuinely increase both the targeted strength itself and overall well-being?

They anchored the whole project in Peterson and Seligman's Virtues in Action model, which organizes 24 character strengths under 6 broader virtues.

How they studied it

This was a large, pre-registered project, essentially a systematic review of many other reviews and trials at once. The team searched four specialized databases, including gray literature, which is research published outside traditional academic journals and often missed by narrower searches, and they ran separate searches for 21 of the character strengths.

They included only randomized controlled trials with adult participants that measured both a targeted strength and well-being before and after the intervention. The scale was enormous. After screening 61,479 abstracts, the team ultimately included 162 randomized trials, covering 15 strengths grouped under the six virtues and representing a combined 33,032 participants.

What they found

Not all strengths were equally supported by the evidence, which is the whole point of doing a review like this. The interventions with the "best evidence for increasing strengths and well-being" were those that enhanced "kindness, humor, hope, perspective, and gratitude," a handful of clear standouts.

At the same time, the review exposed an important gap. There is a relative shortage of high-quality randomized trials in this field, and many of the 24 classic strengths simply have not been tested enough for anyone to know whether cultivating them reliably helps. The authors also flagged a broader methodological need: future studies should include more robust and consistent outcome measures so results can be compared fairly.

What this means for you

If you are curious about positive psychology but unsure where to begin, this review hands you a practical shortlist. Practicing kindness, leaning into humor, nurturing hope, taking the long view (that's perspective), and cultivating gratitude are the strengths with the strongest current evidence behind them for lifting well-being.

That does not mean the other strengths don't matter to you or can't help; it simply means these five are the safest bets given what has actually been rigorously tested so far. A reasonable move is to pick the one that resonates most with who you are and build a small, regular practice around it, rather than trying to work on all two dozen strengths at once and burning out on the effort.

It also helps to match the practice to your own life rather than to a list. Gratitude might mean a few lines in a notebook at night; kindness might mean one deliberate, generous act a day; hope might mean regularly picturing a specific, better future and the concrete steps toward it.

The evidence here suggests these particular directions are well worth your effort, but the version that actually sticks is the one you will genuinely repeat. Rather than treating character strengths as a self-improvement checklist to grind through, you can approach them as a small menu of experiments, trying one for a few weeks, noticing what it does for your mood and your relationships, and keeping whatever earns its place.

Consistency with a single strength you care about will almost always beat scattered attempts at all of them.

The honest caveats

Even a review this large is ultimately limited by the studies inside it, and the authors are refreshingly candid that many strengths have too few solid trials to judge. Crucially, for most strengths there is still "insufficient evidence," which is not the same thing as proof that they do not work.

Only 15 of the 24 strengths were represented in the included trials at all. A synthesis can also inherit the weaknesses of its source studies, including inconsistent outcome measures, which is exactly the problem the researchers called out. So read the standout strengths as where the evidence is currently strongest, not as a definitive ranking of what will work best for you personally, since individual responses to any of these practices can vary quite a lot.