If you are over 40 and notice that managing your weight feels different than it used to, you may be wondering whether your metabolism has changed. Age, muscle mass, activity levels, sleep, hormones, and everyday habits can all influence how much energy your body uses.
That is one reason herbs and plant-derived ingredients attract interest. Green tea, ginger, chili peppers, cinnamon, and other botanicals have been studied for different aspects of metabolic health. Some have evidence for modest effects on energy expenditure or body-weight measures, while others are more relevant to broader metabolic processes.
This guide looks at ten herbs and plant-derived ingredients, explains what research has explored, and offers practical ways to include them in your routine. The goal is to help you understand the evidence and make informed choices—not to promise a particular weight-loss result.
Quick Comparison: Herbs and Plant Compounds for Metabolic Support
| Ingredient | What researchers have studied | Practical way to use it |
|---|---|---|
| Green tea | Catechins, caffeine, energy expenditure, and body-weight outcomes | Brewed tea |
| Ginger | Body weight and selected metabolic markers | Fresh or dried ginger in food or tea |
| Cayenne and capsaicin | Thermogenesis and energy expenditure | Chili peppers or cayenne in meals |
| Cinnamon | Glucose-related and other metabolic outcomes | Add to meals and drinks |
| Ginseng | Blood sugar and other metabolic outcomes | Food or supplement forms, where appropriate |
| Turmeric and curcumin | Inflammatory and metabolic markers | Turmeric in cooking |
| Coffee and caffeine-containing plants | Temporary effects on energy expenditure and alertness | Coffee or tea, taking caffeine tolerance into account |
| Green coffee | Compounds studied for possible weight-related effects | Evaluate product-specific evidence and safety |
| Yerba mate | Caffeine and other plant compounds studied in metabolic research | Brewed infusion |
| Berberine | Glucose metabolism and other metabolic outcomes | Discuss supplement use with a healthcare professional |
The evidence differs by ingredient, preparation, dose, and outcome. Research on a concentrated extract does not necessarily apply to an ordinary serving of the whole food or drink.
What Does It Mean to “Boost Metabolism”?
Metabolism is not a single switch. It describes the processes through which your body uses energy to maintain essential functions, digest food, regulate temperature, and support movement.
When people talk about boosting metabolism, they may mean increasing energy expenditure, influencing how the body uses energy, or supporting other aspects of metabolic health.
One process often discussed in this context is thermogenesis—the production of heat by the body. Certain compounds, including caffeine and capsaicin, have been studied for their potential to temporarily affect energy expenditure or fat oxidation.
These effects need to be interpreted in context. A measurable change in a short-term study does not automatically translate into a substantial long-term change in body weight. The ingredient, amount, preparation, duration of use, and individual all matter.
For adults over 40, it is also useful to consider muscle mass, physical activity, nutrition, and sleep. These are important parts of the wider picture when managing weight and supporting metabolic health.
1. Green Tea
Green tea is one of the better-studied plant-based options in research on energy expenditure and weight-related outcomes.
It contains catechins, including epigallocatechin gallate (EGCG), as well as caffeine. Researchers have studied these compounds for possible effects on thermogenesis, fat oxidation, and body weight. Some reviews of clinical trials report modest changes in weight-related measures with certain green-tea preparations, but findings vary, and the evidence does not establish a large or reliable effect for everyone.
How to include green tea
For many people, brewed green tea is a straightforward way to enjoy it as part of a daily routine. It can be consumed plain or with a meal, depending on personal preference.
Green tea contains caffeine, so consider your sensitivity and the time of day. Concentrated green-tea extracts are different from brewed tea and have been associated with liver injury in some cases. Do not assume that a more concentrated product is necessarily more effective or more suitable.
What to remember: Green tea has been studied for modest weight-related effects, but it is best viewed as one possible part of a broader routine rather than a standalone weight-management solution.
2. Ginger
Ginger is widely used in cooking and drinks, and researchers have examined its potential relationship with body weight and several metabolic markers.
Some randomized trials and meta-analyses have reported improvements in selected measures, including body weight or waist circumference. However, studies differ in design, dose, duration, and participant characteristics, and the certainty of evidence varies. These findings do not prove that ginger alone produces substantial or predictable weight loss.
Easy ways to use ginger
Fresh or dried ginger can be added to:
- Tea and other warm drinks
- Soups and stews
- Stir-fries
- Smoothies
- Oatmeal
- Meals with vegetables and protein
Using ginger in food is a practical way to enjoy its flavor without turning every meal into a supplement routine. If you are considering concentrated ginger supplements, review the dosage and safety information and seek professional advice if you take medication or have a health condition.
What to remember: Ginger is a versatile ingredient with research interest across several metabolic outcomes. The results are promising in some areas, but they should be interpreted carefully.
3. Cayenne Pepper and Capsaicin
Capsaicin is the compound responsible for the heat of cayenne and many chili peppers. It has been studied for potential effects on thermogenesis, energy expenditure, and fat oxidation.
Research suggests that capsaicin-containing ingredients may have modest effects on some of these measures. The size and practical importance of the effect vary, and the findings do not mean that spicy food reliably causes meaningful weight loss.
How to use cayenne
If you enjoy spicy food, try adding chili or cayenne to:
- Eggs and vegetables
- Soups and stews
- Beans and lentils
- Roasted vegetables
- Fish or chicken
- Homemade sauces
Start with an amount you enjoy. If spicy foods cause digestive discomfort, choose other seasonings instead.
What to remember: Capsaicin is relevant to research on thermogenesis, and chili peppers can add flavor to meals. There is no need to force yourself to eat spicy food to support your health.
4. Cinnamon
Cinnamon is often described as a metabolism-boosting spice, but much of the research interest focuses on glucose regulation and other metabolic outcomes rather than a direct increase in calorie expenditure.
Studies of cinnamon supplements have reported mixed results across different measures. The effects of a supplement also cannot automatically be assumed to apply to the smaller amounts used in everyday cooking.
Simple ways to use cinnamon
Cinnamon can add flavor to:
- Oatmeal
- Plain yogurt
- Chia pudding
- Coffee
- Smoothies
- Baked apples
It may help make foods taste sweet without adding sugar. If you use cinnamon frequently or consider a concentrated supplement, remember that different cinnamon varieties have different coumarin levels. Large, prolonged intakes of cassia cinnamon may be unsuitable for some people, particularly those with liver concerns.
What to remember: Cinnamon is a useful culinary spice and has been investigated for metabolic health. It should not be treated as a proven fat-burning ingredient.
5. Ginseng
Ginseng has a long history of traditional use and has been studied for possible effects on blood sugar and other aspects of health. Different species and preparations are not interchangeable, so the details of a study or product matter.
Although laboratory research and some human studies have explored potential metabolic effects, the evidence does not establish ginseng as a reliable way to substantially increase metabolism or produce weight loss.
What to consider
If you are interested in ginseng, check which species is used, how much is included, and what outcome the product claims to support. Ginseng may interact with medicines and may not be appropriate for everyone, so consult a qualified healthcare professional if you take medication or manage a health condition.
What to remember: Ginseng is an area of ongoing research, but product claims should be assessed against evidence for the specific preparation and intended use.
6. Turmeric and Curcumin
Turmeric is a familiar cooking spice. Curcumin is one of its best-known compounds and has been investigated for inflammatory and metabolic markers.
Some research has explored curcumin supplements in relation to measures such as blood sugar regulation and body composition. Results vary, and findings from concentrated preparations do not automatically show that turmeric in food has the same effects.
How to include turmeric
Turmeric can be used in:
- Curries
- Soups
- Lentil dishes
- Rice and grain dishes
- Roasted vegetables
- Egg dishes
Using turmeric in cooking is an accessible way to add flavor and variety. Concentrated curcumin products may differ substantially from culinary turmeric and can have interactions or other safety considerations.
What to remember: Turmeric can be part of a varied diet, while claims about supplements should be judged by evidence for the specific formulation and outcome.
7. Coffee and Other Caffeine-Containing Plants
Caffeine occurs naturally in coffee, green tea, yerba mate, and some other plants. It can temporarily increase alertness and has been studied for short-term effects on energy expenditure.
The response varies with the amount consumed, individual sensitivity, and habitual caffeine use. More caffeine is not automatically better. High intake can contribute to nervousness, anxiety, digestive discomfort, a rapid heartbeat, or disrupted sleep.
Use caffeine thoughtfully
Consider your overall caffeine intake from coffee, tea, energy drinks, and supplements. If caffeine affects your sleep, reduce the amount or avoid it later in the day. Sleep is an important part of maintaining routines that support appetite and weight management.
What to remember: Caffeine has a plausible short-term effect on energy expenditure, but it is important to balance any potential benefit with its effects on sleep and wellbeing.
8. Green Coffee
Green coffee refers to coffee beans that have not been roasted. It contains caffeine and chlorogenic acids, compounds that have been investigated for possible effects on glucose metabolism and weight-related outcomes.
Studies of green coffee extracts have varied in size, quality, formulation, and findings. The available evidence does not justify assuming that green coffee supplements reliably produce meaningful weight loss.
What to check before choosing a product
Look for the amount of extract per serving, the caffeine content, and clear information about the formulation. Be cautious when a product makes broad promises without explaining the evidence behind them.
If you already consume coffee or other caffeinated drinks, consider the combined caffeine intake. Ask a healthcare professional about suitability if you take medication or have a health condition.
What to remember: Green coffee is a research topic, not a guarantee of weight loss. Assess the actual formulation and evidence before considering a supplement.
9. Yerba Mate
Yerba mate is a traditional South American infusion made from the leaves of Ilex paraguariensis. It contains caffeine and other plant compounds and has been studied for a range of possible health effects, including metabolic outcomes.
Research specifically establishing a meaningful weight-loss benefit remains limited. Results from extracts or multi-ingredient products also cannot automatically be applied to a cup of yerba mate.
How to approach yerba mate
If you enjoy it, consider it as a caffeinated beverage and account for your total daily caffeine intake. Avoid drinking very hot beverages, and be aware that caffeine may affect sleep or cause unwanted symptoms in sensitive individuals.
What to remember: Yerba mate can be an alternative to other caffeinated drinks, but it should not be relied on as a proven metabolism booster.
10. Berberine
Berberine is a plant-derived compound that has been investigated particularly for glucose metabolism and other metabolic outcomes. It is often discussed alongside natural metabolism supplements, but its research focus is broader than thermogenesis alone.
Evidence varies across outcomes, formulations, and study populations. Berberine is not interchangeable with other herbs, and it can interact with medicines. It may also be unsuitable during pregnancy or breastfeeding.
Is berberine an alternative to other metabolic supplements?
That depends on the goal. Someone interested in glucose regulation is asking a different question from someone interested in caffeine's short-term effects on energy expenditure or the role of food choices in weight management.
Rather than choosing an ingredient simply because it is described as a metabolism booster, identify the outcome you want to understand and review the evidence and safety information relevant to it. If you have a medical condition or take medication, discuss berberine with a qualified healthcare professional before using it.
What to remember: Berberine deserves a distinct discussion because it is studied for metabolic outcomes beyond thermogenesis. It should not be treated as a universal replacement for other supplements or medical care.
Which Herbs Have the Most Relevant Evidence?
The answer depends on what you mean by “boost metabolism.” Different ingredients have been studied for different outcomes, so they are best compared by the question being asked.
- For thermogenesis and energy expenditure: Green tea compounds, caffeine, and capsaicin have been studied for possible effects, generally with modest or variable findings.
- For body-weight measures: Some studies of green-tea preparations and ginger supplements report changes in weight-related outcomes, but results and evidence certainty vary.
- For glucose-related outcomes: Cinnamon, ginger, turmeric-derived compounds, ginseng, and berberine have been investigated, but the evidence is not identical across ingredients or products.
- For everyday food choices: Ginger, cinnamon, turmeric, and chili peppers can add flavor to meals and make a varied eating pattern more enjoyable.
A key distinction is that evidence for an isolated compound or concentrated extract does not necessarily establish the effect of the whole food, brewed drink, or finished commercial formula. Look for studies that match the ingredient form, amount, and outcome you are evaluating.
Related: How to Choose a Metabolism-Support Herbal Formula
Understanding Your Metabolism After 40
Metabolism is the collection of processes through which your body uses energy to maintain essential functions, digest food, regulate temperature, and support movement. Daily energy needs are influenced by factors such as body size, muscle mass, physical activity, sleep, age, and individual biology.
As you move through midlife, changes in body composition and daily routines can affect how much energy you use and how you manage your weight. This is why a balanced approach to metabolic health looks beyond any single ingredient.
Herbs and plant compounds offer different potential benefits. Green tea and caffeine have been studied for their effects on energy expenditure, capsaicin for thermogenic properties, and ginger and cinnamon for several metabolic outcomes.
The most useful approach is to match each ingredient to its specific evidence and consider how it fits into your everyday routine. Balanced nutrition, regular movement, adequate sleep, and activities that maintain muscle are important parts of the wider picture.
How to Choose Herbs Based on Your Goals
Different herbs and plant compounds have been studied for different aspects of metabolic health. Understanding your goal can help you decide which ingredients deserve closer attention.
For thermogenesis and energy expenditure
Green tea, caffeine, and capsaicin are relevant options to explore because researchers have studied their effects on energy expenditure and fat oxidation. The size and practical significance of these effects vary.
For broader metabolic health
Ginger and cinnamon have been investigated for outcomes that include glucose regulation and other metabolic markers. The evidence depends on the ingredient, preparation, dose, and outcome being studied.
For everyday appetite and weight management
Focus on meals that provide adequate protein, fiber, and satisfying whole foods. These can help support fullness and make a consistent eating routine easier to maintain.
For long-term weight management
Consider the bigger picture: nutrition, physical activity, muscle maintenance, sleep, and habits you can sustain. An herbal ingredient is best evaluated as one possible addition to that routine.
By matching your goals to the available evidence, you can make more informed choices about which herbs to include in your diet and which supplements merit further investigation.
What to Look for in a Metabolism Support Supplement
If you are considering a supplement to complement your metabolic-health routine, start with the formula itself. Understanding its ingredients is more useful than judging a product by the number of compounds listed on its label.
Look for a clearly disclosed ingredient list, stated amounts where available, and evidence relevant to the product's intended purpose. Check whether the supporting research concerns the same ingredient form and dosage used in the formula.
It is also worth considering product quality, cost per serving, caffeine content, and any relevant precautions. Concentrated extracts can differ considerably from the teas and spices you use in everyday cooking.
A supplement may be worth investigating when its formulation, evidence, and safety information align with your goals. Your decision should be based on those details rather than on a promise of rapid weight loss.
Explore the formula and its ingredients to understand what it contains, how it is intended to be used, and what information is available to help you make an informed decision.
Review the Formula and Its Ingredients →
A Simple Natural Metabolism-Support Routine
You do not need to use ten different herbs. A simple routine can include ingredients you enjoy alongside habits that support your overall health.
Morning: Enjoy green tea or coffee if you tolerate caffeine, taking your sleep and total caffeine intake into account.
Meals: Use ginger, cinnamon, turmeric, and other herbs or spices to add flavor to meals containing vegetables, protein, and fiber-rich foods.
Spicy dishes: Add chili or cayenne if you enjoy spicy food and tolerate it comfortably.
Daily movement: Find regular opportunities to walk, exercise, and maintain or build muscle through suitable activities.
Evening: Prioritize a consistent sleep routine and consider limiting caffeine later in the day if it affects your sleep.
The aim is to create a routine that fits your preferences and is practical to maintain, rather than relying on a complicated supplement schedule.
Frequently Asked Questions
Which herbs are commonly studied for metabolism?
Green tea, ginger, capsaicin-containing chili peppers, cinnamon, ginseng, turmeric-derived compounds, and several other plant ingredients have been studied for different metabolic outcomes. The amount and quality of evidence vary, and no single ingredient has been shown to work the same way for everyone.
Can herbs increase metabolism after 40?
Some plant compounds may temporarily influence energy expenditure or have effects on certain metabolic markers. However, age alone does not determine which ingredient, if any, is appropriate. Muscle mass, activity, nutrition, sleep, medication use, and individual health all matter.
Does green tea speed up metabolism?
Green tea contains catechins and caffeine that have been investigated for possible effects on energy expenditure and body weight. Any effects appear modest or variable, and brewed tea should not be assumed to produce substantial weight loss.
Is ginger useful for metabolic health?
Ginger has been studied for body weight and several metabolic measures. Some reviews report promising findings, but differences in study design and evidence certainty mean that results should be interpreted carefully.
What is thermogenesis?
Thermogenesis is the production of heat by the body. It contributes to energy use, and certain compounds, including caffeine and capsaicin, have been studied for their potential to affect this process.
Are herbal metabolism supplements safe?
Safety depends on the ingredients, dose, formulation, and individual circumstances. Concentrated extracts can differ from ordinary foods and drinks, and some ingredients can interact with medicines. Check product information and consult a qualified healthcare professional when appropriate.
Should I take several metabolism-boosting herbs together?
Combining multiple supplements can make it harder to understand their effects and may increase the risk of interactions or unwanted effects. Review each ingredient and seek professional advice before combining concentrated products.
The Bottom Line
Herbs and plant-derived ingredients offer several avenues to explore when learning about metabolic health. Green tea, ginger, and capsaicin have been studied for thermogenesis or weight-related outcomes, while cinnamon, turmeric, ginseng, and berberine have been investigated for other aspects of metabolism.
The most useful choice depends on the outcome you are interested in, the evidence for the specific ingredient, and whether it is appropriate for you. Everyday herbs and spices can add variety to meals, while concentrated supplements deserve closer attention to formulation, evidence, and safety.
For adults over 40, a sustainable approach includes balanced nutrition, regular physical activity, muscle maintenance, and adequate sleep. Herbal ingredients may complement that routine when chosen thoughtfully.
P.S. For personalized guidance, download my free "Metabolic Optimization Checklist," which includes a symptom questionnaire to identify which tier of herbs is right for you, plus meal timing strategies and a lab test interpretation guide.
References
- Green Tea (EGCG):
PMID 19597519 - Capsaicin & Brown Fat:
PMID 23620057 - Ashwagandha (Thyroid):
PMID 28829155 - Berberine (AMPK):
PMID 18397984 - Ginger (Thermogenesis):
PMID 22538111 - Cinnamon (Insulin):
PMID 14633804 - Rhodiola (ATP):
PMID 15256690