Gram Research analysis of 1,087 gym members shows that supplement purchasing is driven by multiple factors working together. People who exercise frequently, are currently dieting, and have strong health and appearance goals are significantly more likely to buy supplements, with men about twice as likely to purchase as women. Interestingly, people with higher body weights were less likely to buy supplements, and highly motivated exercisers tended to make frequent small purchases rather than occasional large ones, suggesting supplements work best as part of a structured fitness routine.
A new study of over 1,000 fitness center members reveals that supplement purchasing isn’t just about wanting to get stronger or healthier. Researchers found that people’s actual body weight, how often they exercise, whether they’re dieting, and their personal fitness goals all influence whether they buy supplements and how much they spend. Interestingly, men were more likely to buy supplements than women, but women who were focused on health and appearance goals were especially likely to make purchases. The study also found that people with higher body weights were less likely to buy supplements, and those who exercised frequently tended to buy supplements more often but in smaller amounts each time.
Key Statistics
A cross-sectional study of 1,087 fitness center users found that people currently dieting were 114% more likely to purchase supplements compared to those not dieting, according to research published in Frontiers in Sports and Active Living in 2026.
Male gym members were 105% more likely to purchase supplements than female members in a 2026 analysis of 1,087 fitness center users, though women with strong health and appearance goals showed particularly high purchase rates.
Among 1,087 gym users studied in 2026, people who exercised more frequently were 79% more likely to buy supplements, but spent less money per purchase, suggesting structured, goal-aligned consumption patterns.
A 2026 study of 1,087 fitness center members found that for every unit increase in BMI, people were 12% less likely to purchase supplements, contradicting assumptions that higher body weight drives supplement interest.
The Quick Take
- What they studied: What makes gym members decide to buy supplements and how much money they spend on them. Researchers looked at body weight, exercise habits, dieting, fitness goals, and whether being male or female made a difference.
- Who participated: 1,087 people who regularly use fitness centers. Researchers measured their actual height and weight and asked them questions about how often they exercise, whether they’re dieting, and what motivates them to work out.
- Key finding: People who exercise frequently, are currently dieting, and have strong health and appearance goals are more likely to buy supplements. Men were about twice as likely to purchase supplements as women. However, people with higher body weights were less likely to buy supplements at all.
- What it means for you: If you’re thinking about buying supplements, understand that your decision is influenced by multiple factors beyond just wanting better results. Your fitness goals, how often you exercise, and your current diet all play a role. This research suggests that supplement purchases reflect a person’s overall fitness commitment rather than a quick fix.
The Research Details
Researchers recruited 1,087 people from fitness centers and collected information in two ways. First, they measured each person’s height and weight directly at the gym to calculate their body mass index (BMI), which is a measure of body size. Second, they asked people questions about how often they train, whether they’re following any kind of diet, and what motivates them to exercise. They also collected information about whether people bought supplements at the gym and how much money they spent.
The researchers then looked at five different exercise motivations (like wanting to be healthy, wanting to look good, wanting to build muscle, or wanting to lose weight) and used a statistical method to organize these into two main groups of motivations. One group combined health and appearance goals together, while the other group separated people who wanted to build muscle from those who wanted to lose weight.
Finally, the researchers used advanced statistical methods to figure out which factors predicted whether someone would buy supplements and how much they would spend. They also tested whether being male or female changed these patterns.
This research approach matters because it looks at supplement purchasing in the real world rather than in a laboratory setting. By measuring people’s actual body weight instead of just asking them, the study provides more accurate information. By examining multiple factors together (body size, exercise habits, diet, and motivation), the researchers could see how these pieces work together to influence purchasing decisions. This gives a more complete picture than just looking at one factor alone.
The study’s strengths include a large sample size of over 1,000 participants and the use of objective measurements for body weight rather than relying on people’s estimates. The researchers also tested whether their findings were different for men and women, which is important because sex differences are common in fitness behavior. However, because this is a cross-sectional study (a snapshot in time), it cannot prove that one factor causes another, only that they are related. The study was conducted in fitness centers, so the results may not apply to people who don’t use gyms. Additionally, the study relied on people’s self-reported information about dieting and exercise frequency, which may not be completely accurate.
What the Results Show
The study found that four main factors made people more likely to buy supplements. People who exercised more frequently were 79% more likely to purchase supplements. People who were currently dieting were more than twice as likely (114% more likely) to buy supplements. Men were about twice as likely (105% more likely) as women to purchase supplements. People who had strong health and appearance goals were 88% more likely to buy supplements.
Interestingly, higher body weight had the opposite effect. For every unit increase in BMI, people were 12% less likely to buy supplements. This was unexpected and suggests that people with higher body weights may approach fitness differently than those with lower body weights.
The researchers also found an important difference between men and women. Among women, having strong health and appearance goals made them especially likely to buy supplements. This effect was stronger for women than for men, suggesting that women who are motivated by health and appearance concerns are particularly interested in supplements.
When looking at how much money people spent per purchase, the patterns were different. People who were highly motivated by health and appearance goals actually spent less money per purchase, even though they were more likely to buy. People who exercised very frequently also spent less per occasion. This suggests that highly motivated exercisers make many small purchases rather than fewer large purchases, possibly because they buy supplements regularly as part of their routine.
The study found that the relationship between body weight and supplement spending did not work through motivation. In other words, body weight didn’t influence spending by first changing people’s fitness goals. Instead, body weight and spending were directly related. Additionally, the study showed that people’s reasons for exercising could be grouped into two main patterns: one combining health and appearance goals, and another separating muscle-building goals from weight-loss goals. The muscle-building versus weight-loss distinction also predicted spending patterns, with spending varying based on which goal was more important to each person.
Previous research has often focused on supplement use among competitive athletes or people trying to build muscle. This study is different because it looks at regular gym members with a wide range of fitness goals. The finding that body weight is negatively associated with supplement purchasing is particularly interesting because it contradicts some assumptions that people with higher body weights would be more interested in supplements for weight loss. The study also adds to our understanding of how sex differences appear in fitness behavior, showing that motivation affects men and women differently when it comes to supplement purchases.
This study has several important limitations. Because it was conducted at a single point in time, it cannot show whether these factors actually cause supplement purchases or just happen to be related. The study only included people who use fitness centers, so the results may not apply to people who exercise at home or outdoors. The researchers asked people only one yes/no question about dieting rather than getting detailed information about what type of diet they were following. The study measured supplement purchases at the gym, so it doesn’t include supplements people buy elsewhere. Finally, the study was conducted in 2026, and supplement trends may change over time.
The Bottom Line
If you use a gym and are considering supplements, think about whether they align with your actual fitness goals and exercise routine. The research shows that people who are most successful with supplements are those who exercise regularly and have clear fitness goals. Before buying supplements, consider whether you’re exercising consistently enough to benefit from them. If you’re dieting, understand that supplements are not a replacement for good nutrition from whole foods. Talk to a fitness professional or doctor before starting any supplement, especially if you have health conditions or take medications. The evidence suggests that supplements work best as part of a structured fitness plan, not as a standalone solution.
This research is most relevant to people who use fitness centers and are thinking about buying supplements. It’s particularly useful for gym owners and fitness professionals who want to understand their members’ purchasing patterns. The findings may also interest people who are starting a fitness routine and wondering whether supplements are right for them. However, the study doesn’t apply to competitive athletes or people with specific medical conditions, who may have different supplement needs.
If you decide to try supplements as part of your fitness routine, realistic expectations are important. Most supplements don’t produce noticeable results in days or weeks. If you’re using supplements to support muscle building, you should expect to wait at least 4 to 8 weeks to see changes, and these changes will only happen if you’re also exercising consistently and eating well. For supplements aimed at general health or recovery, benefits may take several weeks to become noticeable. The key is consistency: the research suggests that people who buy supplements regularly as part of their routine are more likely to see benefits than those who buy occasionally.
Frequently Asked Questions
Do I need to buy supplements if I go to the gym regularly?
Not necessarily. Research shows that 1,087 gym members who bought supplements were more likely to exercise frequently and have clear fitness goals, but supplements aren’t required for results. Focus first on consistent exercise and good nutrition from whole foods.
Why do men buy more supplements than women at gyms?
A 2026 study of 1,087 gym users found men were twice as likely to purchase supplements as women. However, women with strong health and appearance goals were especially likely to buy, suggesting motivation matters more than gender alone.
Should I buy supplements if I’m trying to lose weight?
People currently dieting were 114% more likely to buy supplements in a study of 1,087 gym members. However, supplements work best alongside consistent exercise and healthy eating, not as a replacement for them.
How often should I buy supplements if I’m serious about fitness?
Research on 1,087 gym users shows highly motivated exercisers make frequent small purchases rather than occasional large ones, suggesting regular, consistent supplement use aligns better with fitness goals than sporadic buying.
Does my body weight affect whether I should buy supplements?
A 2026 study found people with higher body weights were less likely to buy supplements, but this doesn’t mean they shouldn’t. Supplement decisions should be based on your fitness goals and exercise routine, not body weight alone.
Want to Apply This Research?
- Track your supplement purchases weekly, including the type of supplement, amount spent, and your exercise frequency that week. This helps you see whether your supplement spending matches your actual workout consistency and fitness goals.
- Set a specific fitness goal (like exercising 4 times per week) before buying supplements. Use the app to log your workouts for 2 weeks, then decide whether supplements make sense for your routine. This ensures you’re buying supplements to support an actual fitness commitment rather than as a standalone purchase.
- Create a monthly review where you compare your supplement spending to your exercise frequency and progress toward your fitness goals. Track whether you’re making consistent small purchases (like highly motivated exercisers in the study) or occasional large purchases. Adjust your supplement strategy based on whether you’re actually using them as part of a structured routine.
This research describes patterns in supplement purchasing behavior among gym members but does not constitute medical advice. Supplement safety and effectiveness vary by product and individual health status. Before starting any supplement, consult with a healthcare provider, especially if you have existing health conditions, take medications, or are pregnant or breastfeeding. This study was conducted in fitness centers and may not apply to all populations. Individual results depend on many factors including diet, exercise consistency, sleep, and overall lifestyle.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.