Garcinia cambogia

Garcinia Cambogia (Malabar Tamarind) is a fruit that is known to enhance the culinary experience of food, and enhances satiety from a meal (possibly by enhancing the flavor experience). Its usage as a fat burner does not appear to extend to humans.

This page features 48 unique references to scientific papers.


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Garcinia Cambogia (Malabar Tamarind) is a small fruit that has some traditional usage to enhance the culinary experience of a meal, but beyond that has limited medicinal usage. It is a very good source of hydroxycitric acids (structurally related to citric acid, a sour flavorant) and one of the isomers, known as (-)-Hydroxycitric acid, is thought to help in weight control.

The mechanism of action is inhibiting an enzyme called Citric acid lysase which is required in the synthesis of fatty acids, known as de novo lipogenesis. At least in rats, evidence of suppressed de novo lipogenesis has been noted and oral consumption of (-)-Hydroxycitric acid appears to reliably reduce food intake and body weight (the latter to a degree where food intake cannot explain all the observed effects)

Studies in humans, for the most part, fail to replicate this; this may be related to less actual activity of de novo lipogenesis in humans and a much higher level in rats. Some isolated studies do note weight loss, but it appears to be quite variable and unreliable. Many studies also do report subjective appetite decrease, but tend to record dropout rates (how often people leave the study due to being unable to maintain the diet protocol) rather than food intake; even then the benefits are still unreliable and sometimes not present.

Although there is some limited potential for (-)-Hydroxycitric acid as a weight loss aid, the magnitude of effect is quite low (up to 2kg over 3 months) and the benefit is unreliable; making it hard to recommend this compound as a fat burner or anti-obesity agent.

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Also Known As

Gambooge, Pazham Puzhi, Bitter Kola, Malabar tamarind, (-)-Hydroxycitric acid, HCA, Hydroxycitric acid


Do Not Confuse With

Hoodia gordonii (another ineffective appetite suppressant)


Is a Form of


Caution Notice

Examine.com Medical Disclaimer

Standard dosing of Garcinia Cambogia and its bioactive, (-)-Hydroxycitric acid, is 500mg of (-)-Hydroxycitric acid taken 30-60 minutes prior to a meal and usually taken at up to three different meals daily.

It is unsure if this is the ideal dose since human studies usually fail to find a benefit with any dosage.


The Human Effect Matrix looks at human studies (excluding animal/petri-dish studies) to tell you what effect Garcinia cambogia has in your body, and how strong these effects are.
GradeLevel of Evidence
ARobust research conducted with repeated double blind clinical trials
BMultiple studies where at least two are double-blind and placebo controlled
CSingle double blind study or multiple cohort studies
DUncontrolled or observational studies only
Level of Evidence
EffectChange
Magnitude of Effect Size
Scientific ConsensusComments
BWeight

Although there is some counter evidence, it tends to be less robust and for the most part there is no significant weight reducing effect of garcinia cambogia supplementation

CApolipoprotein B

No significant influence on apolipoprotein B detected

CHDL-C

No significant influence on HDL-C levels

CTriglycerides

No detectable influence on triglyceride levels

CLDL-C

Garcinia appears unable to influence LDL-C levels based on preliminary evidence

CTotal Cholesterol

No significant alterations seen in total cholesterol levels

CFood Intake

Food intake appears to be unaltered following ingestion of garcinia supplements, which is different than results seen in rats

CAppetite

No significant influence of acute HCA supplementation on appetite when taken before a meal

CTestosterone

Testosterone appears to be unaltered following ingestion of garcinia cambogia

CEstrogen

No significant influence on circulating estrogen levels associated with garcinia


Studies Excluded from Consideration


Disagree? Join the Garcinia cambogia Discussion

Table of Contents:


Edit1. Sources and Composition

1.1. Sources

Garcinia Cambogia (of the family Guttiferae), sometimes also referred to as Pazham Puzhi[4], Malabar tamarind,[5] or Bitter Kola[6] is a plant that bears small fruits (5cm diameter) and has traditionally been used as a food additive to both enhance the flavor of food products and to enhance satiety following consumption.[5] Very limited traditional medicine usage extends to gastrointestinal complications.[5]

1.2. Composition

The fruits of Garcinia Cambogia tend to contain:

  • Citric Acids (causative of taste and flavor) at 10-30% dry weight, of which a large segment consists of hydroxycitric acids (HCAs);[7] HCAs come in four isomers, (-)-Hydroxycitric acid, (+)-Hydroxycitric acid, (-)-Allo-HCA, and (+)-Allo-HCA[5]
  • Guttiferone I-K[8][9] and M-N[8]
  • The polyisoprenylated benzophenones Garcinol[9] and Isogarcinol[10]
  • Xanthochymol (highly variable between 113.66+/-0.75ng/mL fruit and undetectable) and Isoxamthochymol (23.26ng/mL or lower); about 2.52-2.56ng/mL of both in the leaves[11][12]
  • Cambogin, an isomer of isoxanthochymol[10] and Camboginol[13] (88.2mg/g of the fruit methanolic extract; undetectable in aqueous extracts, seeds, or stems)[10]
  • Isoxanthochymol (16.6mg/g methanolic extract; none in aqueous extract of the stems/seeds)[10]

It should be noted that currently marketed (-)-Hydroxycitric Acid supplements tend to be calcium/potassium salts of (-)-HCA containing about 60% (-)-HCA by weight.[5]


Edit2. Pharmacology

2.1. Serum

2g of (-)-HCA salts given to 4 human participants on an empty stomach resulting in plasma levels of 0.8μg/mL within 30 minutes leading up to plasma levels of 8.4μg/mL at two hours with a variable peak between 4.7 and 8.4μg/mL.[14] The authors hypothesized that if absorption was complete and evenly distributed, it would have resulted in a serum peak of 46μg/mL (based on the participant's body weight and 25% body fat), a preliminary guess at the bioavailbility of (-)-Hydroxycitric acid following oral administration would be 10-18%.[14]

The bioactive has been demonstrated to appear in the blood following oral administration, and may have bioactivity


Edit3. Neurology

3.1. Appetite

In freshly prepare rat brain slices, (-)-Hydroxycitric acid (salt form; 60% HCA by weight) was able to inhibit serotonin reuptake into rat corticol slices by 20% (300uM concentration), which was outperformed by fluoxetine (100uM) plus clomipramine (10uM) which inhibited 30% of uptake; oddly, no inhibition was noted with 1000uM (1mM) of (-)-Hydroxycitric acid.[15] The increased bioavailability of serotonin is thought to be related to appetite suppressing effects of supplemental (-)-Hydroxycitric acid.[15]

Another possible mechanism is the thought to be leptin related. One rat study (that failed to find reductions in food intake or weight after 4 weeks of 3.3% (-)-Hydroxycitric acid) noted that serum levels of insulin and leptin decreased, which was thought to be in response to leptin-mimetic actions (not established).[16]

May inhibit the reuptake of serotonin (not yet confirmed in a living model)

In rats who have had the reductions in feed intake quantified, it has been reported to be reduce by 13.7% (0.2% feed intake), 26.7% (2% feed intake) and 25.6% (5% feed intake) in male rats with similar reductions in female rats, with significant reductions of feed intake in this study only occurring 46 days after consumption (earliest) or 74 days (all tested doses).[17]

In rats, appears to suppress food intake

3.2. Neuroprotection

Garcinia Cambogia has once been associated with reduced brain oxidation and pathology of neurodegeneration, but was said to be working vicariously through reduced food intake and body weight (with the study concluding that the state of obesity and a high fat diet impairs neural function).[18]


Edit4. Cardiovascular Health

4.1. Lipoproteins and Cholesterol

A study in rates using 200-400mg/kg Garcinia Cambogia seeds (ethanolic extract) noted slight but statistically significant increases in LDL-C (the 'bad' cholesterol) with decreases in HDL-C, vLDL-C, and triglycerides.[6]

In obese humans given 2g of Garcinia Cambogia (60% Hydroxycitric acid) for 10 weeks, there were no significant alterations in ApoA1, ApoB, Phospholipids, Free Fatty acids, or the Artherogenic Index.[19]

4.2. Blood

One study on blood lipids also noted a small but significant increase in red blood cell count, indicative of erythropoeisis.[6] One review[5] suggests this may be due to the iron content of the seeds, or perhaps an increase in testosterone from the polyphenolic component.


Edit5. Interactions with Fat Mass

5.1. Mechanisms

(-)-Hydroxycitric acid appears to be a competitive inhibitor of the enzyme adenosine triphosphate-citrate (pro-3S)-lyase (a shorter designation is ATP Citrate Lysase),[20] which is an enzyme in the biosynthetic pathway of fatty acids (de novo lipogenesis) and its inhibition results in suppressed formation of Acetyl-CoA from Citrate and less substrate for fatty acid synthesis in vitro.[21] The (+)- isomer of Hydroxycitric acid does not have this same inhibitory potential, and is instead a substrate of the enzyme.

Can inhibit an enzyme in the de novo lipogenesis pathway that mediates fatty acid synthesis from non-fat sources, thought to inhibit the synthesis and deposition of fatty acids via this mechanism

The relevance of this pathway to humans may be in question, as human capacity for de novo lipogenesis does exist but tends to be less than that of rodents that are commonly used in research.[22]

In regards to this mechanism of action, there may be species-related differences

5.2. Adipokines

2g of Garcinia Carmbogia for 10 weeks was associated with a reduction in the adipokine Adipsin (19%) without significantly influencing Adiponectin or Leptin.[19]

5.3. Weight Regain

There have been a few studies assessing weight regain. One in rats who were semi-starved (less than 10g of food daily for 10 days) who were subsequently randomized to receive normal diets of standard chow, sucrose loaded chow, glucose loaded chow or a high glucose fat diet with half of each group recieving 3% (-)-Hydroxycitric acid (85mmol/kg) and then followed for 10 days (so overall, 8 groups of which 4 had HCA supplementation).[23] This study noted that the inevitable weight regain in these rats was attenuated with HCA supplementation in all groups except normal chow, and only reached significance with glucose and glucose+fat diet groups; this was in part due to less food intake, and appeared to decrease the food efficiency ratio with all groups except standard chow.[23] This trial style was replicated with the glucose group, and it was noted that food intake was suppressed for a short time, and although there was indication that de novo lipogenesis may have been inhibited there was no significant suppressive effect on body weight regain.[24]

Two rat studies suggesting that Garcinia can reduce the amount of weight regained during a period of overfeeding after a period of low caloric intake

5.4. Weight Gain

A rat trial in which rats were fed an obesogenic diet for 15 days with 2% added (-)-Hydroxycitric acid (as trisodium conjugate) noted that the food efficiency ratio decreased to 60% of control, and that body weight gain was suppressed to approximately half (49%) of control; food intake also decreased 17%, which would have contributed to the observed reduction in weight.[25]

One rat study suggesting that Garcinia can attenuate the rate of weight gain

5.5. Weight Loss

A study in human subjects using 2g Garcinia cambogia (60% Hydroxycitric acid) for 10 weeks in 86 overweight adults failed to find significant differences in weight loss or food intake.[19] One study using 2400mg of Garcinia cambogia daily divided before meals noted that while active treatment lost more weight from a low calorie diet than placebo over a period of 12 weeks (3.7+/-3.1kg weight loss rather than 2.4+/-2.9kg) that there were no reported differences in appetite.[26]

One of the larger and better controlled studies on the matter noted that, 1000mg of Garcinia Camboga (50% HCA by weight) taken before the three main meals of a low calorie diet given to overweight but otherwise healthy adults (of which placebo was also placed on) and then followed for 12 weeks failed to find any significant differences in dropout rates, weight loss, or adverse effects relative to placebo.[27]

Studies done in humans using isolated Garcinia Cambogia have mixed results on fat loss, with the one study reporting benefit showing relatively low magnitude of benefit (1.3kg more than placebo over 3 months, with very high variability)

In 40 persons with a BMI between 27.5-39 (mostly obese) given 100mg Garcinia Cambogia (confounded with inclusion of 400mg Inulin and 200mg White Kidney bean extract) before each of the three major meals for a period of 12 weeks, with both placebo and supplemental group being advised to diet (1200kcal), noted that weight loss in the diet and supplement group was greater (4% body weight over 12 weeks) than the diet and placebo group (not statistically significance).[1] Dropouts from the study were also greater in placebo (6) than supplement (1) groups.[1] One other study that uses Garcinia Cambogia but is highly confounded with other nutrients also noted beneficial effects on weight loss.[3]

The studies that are associated with both weight loss and Garcinia Camboga are confounded with many ingredients, and the observed effects on fat loss cannot be attributed to Garcinia itself

Several reviews on the efficacy of Garcinia Cambogia suggest no significant benefit for weight loss in human interventions.[28][29][30][31][32] The rather frequent inclusion of Garcinia Cambogia in review articles relative to the lack of interventions may be related to the popularity of the supplement.

Numerous review articles assessing the evidence of Garcinia Cambogia conclude that there is no significant benefit of this compound in humans


Edit6. Interactions with Glucose Metabolism

6.1. Glycogen

When 500mg (-)-Hydroxycitric acid is consumed alongside 2g/kg carbohydrate post exercise in humans, a slight increase in the rate of glycogen resynthesis occurs.[33]


Edit7. Interactions with Hormones

7.1. Testosterone

1667.3mg of Garcinia Cambogia for 12 weeks (1000mg (-)-Hydroxycitric acid) failed to find significant influences on serum testosterone.[34]

7.2. Estrogen

1667.3mg of Garcinia Cambogia for 12 weeks (1000mg (-)-Hydroxycitric acid) failed to find significant influences on serum estrogens (estrone and estradiol).[34]


Edit8. Interactions with Organ Systems

8.1. Kidney and Bladder

While ingestion of a high-fat or high-sucrose diet is able to increase serum levels of urea and creatinine (thought to be indicative of kidney impairment), coingestion of Garcinia Cambogia at 50mg/kg is able to effectively normalize the increases in creatinine and urea.[35]

Oral ingestion of the leaves from Garcinia Cambogia at 100-200mg/kg of either the water extract or ethanolic extract was able to increase urine output in the range of 36-72% (ethanolic) or 17-39% (aqueous), both of which underperformed to 20mg/kg injections of the reference drug furosemide.[36]

The leaves of Garcinia may have weak diuretic properties

8.2. Testes

One study noted that oral consumption of 778-1244mg/kg bodyweight of (-)-Hydroxycitric acid to rats for up to 93 days was associated with testicular toxiciy with lower doses not associated with testicular toxicity.[37] This study has been critiqued,[38] where the lack of assurance on the salt form was questioned and the fact that the No Obervable Adverse Effect Limit (NOAEL) of 389mg/kg in rats is still 10-16 fold higher than the typical recommended serving for humans.[38]

A lone report on testicular toxicity with high dose (-)-Hydroxycitric acid consumption; may not be relevant to human supplementation doses


Edit9. Safety and Toxicology

9.1. General

Acute (14 day) administration of 5000mg/kg bodyweight (-)-Hydroxycitric Acid to albino rats of both genders (small sample size of 10) was not associated with any mortality or clinical signs of toxicology.[15]

Studies that do not inhernetly design themselves to assess toxicology but nevertheless use (-)-Hydroxycitric acid supplementation have also failed to find any toxicity associated with 3% of the rat diet for 5 days[24] or 10 days,[23] or up to 5% of the feed for 90 days.[39]

Currently, the human trials cited in Examine do not report any adverse effects that occur in the treatment groups (using Garcinia Camboga) to a greater degree than placebo.

No observable toxicity in rats or humans following oral ingestion at this moment in time

9.2. Mutagenicity

A preliminary study assessing the mutagenicity of (-)-Hydroxycitric acid on five strains of Salmonella typhimurium (TA98, TA100, TA102, TA1535, and TA1537) up to 5000mcg/plate failed to find evidence of DNA damage or mutagenicity associated with (-)-Hydroxycitric Acid[40] and a lack of genotoxicity was repeatedly demonstrated elsewhere with the Ames test;[40][41] this latter study noted that (-)-HCA increased the amount of micronucleated polychromatic erythrocytes (MNPCEs) after intravenous administration, which is though to be genotoxic.[41] The conclusion of this has been criticized for being suggestive of genotoxicity while the study had some design flaws (used DSMO alongside (-)-HCA while control got water, DMSO not being recommended for this test[42]) and no LD50 test of the method of administration prior to genotoxicity testing.[43]

In rats given up to 5% (-)-Hydroxycitric acid in feed intake for a period of 90 days, there does not appear to be any significant DNA fragmentation in the liver or testicles.[17]

There does not appear to be any influence of the bioactive (-)-Hydroxycitric acid on DNA fragmentation or genomic damage; unlikely to be carcinogenic

9.3. Case Studies

There are numerous case reports of hepatoxicity associated with a supplement known as 'Hydroxycut' which touts Garcinia Cambogia as the main active ingredient,[44][45] although it has been argued that there is no evidence to suggest a link to (-)-Hydroxycitric acid due to inclusion of many ingredients.[46]

In a patient on chronic Monteluskat treatment who then consumed two supplements, fatality occurred; it was thought that Montelukast interacted advesely with one of the many compounds consumed but causative could not be linked.[47]

One reported case of Rhabdoyolysis associated with a dietary supplement of which contained Garcinia Cambogia has been noted, although Ma Huang (plant source of Ephedrine) is a large confound alongside Chromium and Guarana.[48]

Due to the usage of Garcinia in fat burners, there has been reported connections between Garcinia and adverse effects; there is currently no evidence to assume a direct link between the compounds

References

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  44. Stevens T, Qadri A, Zein NN. Two patients with acute liver injury associated with use of the herbal weight-loss supplement hydroxycut. Ann Intern Med. (2005)
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  47. Actis GC, et al. Fatal liver failure following food supplements during chronic treatment with montelukast. Dig Liver Dis. (2007)
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