Why is it that so few diet products are backed by science? Let’s find out if Fastin is one of the good ones. Our in-depth review examinied the ingredients, side effects, customer care and clinical studies. Additionally, we analyzed hundreds of dieter comments posted on the web. Then, we summarized and refined to give you the info you need.
What is Fastin?
To start off, Fastin is a “rapid fat-loss catalyst”. The ingredients include thermo-rx, phenylethylamine HCL, methylsynephrine HCL, theobromine anhydrous, 1,3-dimethylamine HCL, synephrine HCL, N-methyl-b-phenylethylamine HCL, yohimbine HCL and caffeine 100mg. You’ll take one or two tablets in the morning and another after lunch. It supposedly increases thermogenesis, energy and weight-loss.
Fastin was introduced around 2010 from Hi-Tech Pharmaceuticals. The supplement is sold through the official website and through trusted retailers. We like that it contains a few natural ingredients and that we found some positive customer comments, but read on…
Lack of Results – “No Weight-Loss?”
Our first concern with Fastin ingredients was the lack of results. “At first glance, the profile is promising,” said our Research Editor. “But, customer reviews are telling a different story.”
“I was stuck at the same weight for over 2 weeks and was working out over 60 min a day,” stated a user.
“No results. I thought this was supposed to provide rapid fat loss,” commented another.
We did located Fastin reviews talking about people seeing solid results.
“It curbs my appetite and gives me the energy I need to get up and go and lasts all day,” said a dieter.
Fastin Side Effects – “Complaints”
According to customer reviews, Fastin side effects are a major issue. One dieter said, “I took 1 tablet, my heart was racing. I then tried 1/2 tablet and still the same result. Not for me. I’m tossing them.”
Another stated, “After 30 minutes, however, my heart started racing, my body and hands began shaking and I felt as though I was going to pass out when standing. I had to sit down until I felt in control.”
While side effects are rare, we did find some Fastin reviews where customers reported no adverse reactions.
“I have had no side effects whatsoever. It never sped my heart up or gave me jitters at all,” reported a dieter.
“I just started using Fastin and I like it better than other diet pills I’ve tried because it doesn’t make me feel sick/nauseous,” said a customer.
After years of research, we’ve concluded that if a particular part of a weight-loss supplement is problematic, like being the cause of adverse reactions, long-term success is reduced. Is it worth it if you use Fastin and experience negative side effects?
The Science – “Based on Research?”
We did not find any scientific studies to support the weight-loss claims related to Fastin diet pills, but that doesn’t mean none of the ingredients are effective. Caffeine may boost metabolism, but there’s no connection between the ingredient and this particular formula. At DietSpotlight, solid science is critical to the review process. When there are no studies used to back the claims, we raise the red flag.Also: read our Leptigen Weight-Loss Kit review »
The Bottom Line – Does Fastin Work?
Ladies and gentlemen, the clock is up on this one. While it’s good to see that some Fastin ingredients are natural and that we found some positive customer comments, the lack of research used to support the claims is concerning. We’re also a bit hesitant about this one due to customer comments about the lack of results and negative side effects.
If you’re a dieter who wants to those extra pounds, we suggest going with a supplement that’s not connected to harmful side effects and backed by reviews showing it promotes weight-loss.
Among the best products we’ve seen this year is one called Leptigen. The supplement contains four clinically-tested ingredients that have been shown to help ignite fat loss and accelerate metabolism. While there’s no mention of harmful side effects, dieter reviews reveal people are seeing outstanding results.
It’s a good sign that the makers of Leptigen are so confident in the supplement that they’re offering a Special Trial Offer.
Previous Fastin Review (Updated November 19, 2014):
What You Should Know about FastinFastin was originally offered by prescription by the pharmaceutical company King Pharmeceuticals for Smith Kline Beecham. The company pulled the Fastin from the market in 1998, and Hi-Tech Pharmeceuticals acquired the rights to the formula and modified it to make it safe for over the counter sales. Also under this company's umbrella is the sibling supplement Fastin XR. Today, Fastin is available through the product website, although the powerful stimulant contained in the formula makes it a good idea to check with a doctor before taking this supplement. Fastin combines ingredients that will elevate the mood while stimulating the metabolism. The mood elevator makes it easier to stick with a diet and exercise program until weight loss goals are met. The powerful stimulants in the formula will offer an energy boost to help you make it through your workouts while boosting your metabolism. It should be noted that some stimulants have been pulled from the diet market because of potentially dangerous side effects that can occur. Regrettably dangerous side effects lead to litigious action as is the case with Estrin-d and Activia also. While the stimulant in Fastin is allowed in diet formulas, it is still a good idea to check with a doctor to ensure the ingredients are safe for you.
IngredientsWe are pleased to see that the Fastin website offers a complete ingredient list for their product. This list includes Phenylethylamine HCL, R-Beta-Methylphenylethylamine. methylphenylethylamine tartrate , methylsynephrine HCL , N-Methyl-phenylethylamine HCL, Synephrine HCL, Theobromine Anhydrous, Yohimbine HCL and caffeine. Phenylethylamine HCL is a powerful stimulant, but it is not the only one in the formula. As a side note, Triadalean is almost entirely made of phenylethylamine compounds. Dieters with heart conditions, hypertension, thyroid disorders or those on prescription medications should check with their doctor before taking this formula. It is not recommended for women who are pregnant or nursing. Those who are sensitive to caffeine may find that Fastin has undesirable side effects like jitteriness, anxiety or difficulty sleeping. The product should not be taken too close to bedtime because insomnia can occur.
Product FeaturesFastin is available on a free trial through the product website. However, if you order the product and do not cancel within the first fourteen days after placing your order, you will be enrolled in the Fastin auto ship program. This means that you will receive a 60-day supply of the supplement bi-monthly and your credit card will be automatically charged. The current cost of Fastin is about $70 per month at the time of this review.
Advantages of Fastin
- Fastin has stimulants that will speed the metabolism and boost energy.
- The product also contains mood elevators that can help you stick with your diet program.
Disadvantages of Fastin
- Fastin does not contain an effective appetite suppressant.
- The formula may have undesirable side effects in some people.
- Fastin is not safe for everyone.
- Initial order of the product will sign customer up for auto ship program.
- The product is rather expensive.
The Conclusion on FastinFastin may help some that are extremely overweight and have not seen success with diet and exercise alone. In that respect it is similar to Optifast. However, we prefer a diet supplement that contains a safe but effective fat burner and an appetite suppressant for best results.
Fastin Questions & Answers:
We picked apart hundreds of user comments about Fastin into this helpful FAQ.
What are the side effects of Fastin?
Some potential side effects of Fastin are dryness of mouth, euphoria, insomnia, dizziness, restlessness, jitteriness and increased heart rate.
What are the ingredients in Fastin?
Fastin ingredients are methylphenylethylamine tartrate, methylsynephrine hcl, n-methyl-phenylethylamine hcl, synephrine hcl, theobromine anhydrous, yohimbine hcl, caffeine, dextrose, microcrystalline cellulose, hydroxypropyl methylcellulose, stearic acid, magnesium stearate, sodium starch glycolate, starch and silica.
Does Fastin work?
There’s no scientific research proving the effectiveness of Fastin. We found studies linking caffeine to weight-loss, but not specific to this formula.
How much does Fastin cost?
One bottle of Fastin costs $49.95. When you order two, the price increases to $95.90. Three runs $134.85. A discount is applied when you purchase more than two bottles.
How should I take Fastin?
You should take one or two Fastin capsules in the morning and another after lunch. The company suggests not exceeding the recommended serving and not taking in the evening.
Can I take Fastin if I have a health condition?
Women who are pregnant or nursing, people with health conditions of an kind, those taking prescription medication or anyone under 18 years of age should consult with a healthcare provider prior to using a weight-loss supplement, including Fastin.
What do users like about Fastin?
Some dieters liked that the availability of Fastin and that the price was reasonable.
What do users NOT like about Fastin?
We found that users didn’t like the side effects of Fastin.
How do I contact the Fast customer service department?
You can contact the Fastin customer service department by calling 1-800-310-9108, emailing a representative at firstname.lastname@example.org or mailing correspondence to Hi-Tech Pharmaceuticals 6015 Unity Dr. Suite B Norcross, GA 30071.
Can I contact Fastin through social media?
Is Fastin the same as phentermine?
No, Fastin isn’t the same as phentermine. The latter is a prescription medication and the former is sold over-the-counter.
Are there any FDA advisories on Fastin?
Yes, there are FDA advisories on Fast. The agency contacted Hi-Tech Pharmaceuticals in April of 2015 about the potential dangers of r-beta-methylphenethylamine.
How much caffeine is in Fastin?
Each serving of Fastin, one capsule, contains 100mg of caffeine.
Does Fastin come with a guarantee?
There’s no mention of a guarantee with Fastin. The official website sells the product, but doesn’t provide information on the return policy.
Do you know of any special deals or discounts on Fastin?
There are special deals and discounts on Fastin. If you purchase multiple bottles, you’ll receive money off the price. However, our readers have been excited about taking advantage of theSpecial Trial Offer from Leptigen. Click above to learn more.
Fastin Scientific Abstracts:
Measures of strength had been improved within all participant groups (p<0.05), while displaying no substantial time x treatment interactions. No substantial main effects or any interactions were noted for peak power. In the case of total power, a time x sprint interaction had been noted (p<0.05), without noteworthy interactions in the treatment groups. There had been an observation of a time x treatment interaction for serum creatinine values (p<0.05) that had displayed elevations in all of the groups except the placebo. 4 participants had reported minor gastrointestinal discomfort with creatine and caffeine anhydrous combination, with no adverse effects noted in any other group. The conclusion indicates that neither creatine by itself, or mixed with coffee or caffeine anhydrous had any significant impact on participant’s performance in comparison to the placebo. 
As expected, caffeine had an effect on the subject’s mood, alertness and cardiovascular parameters. Theobromine had differing responses according to dose, showing limited effects at 250mg and higher doses, negative mood effects. Theobromine had also dose-dependently raised heart rate. In conclusion, high doses of Theobromine were observed in humans and found that, at normal intake ranges, could lend a contribution to the positive effects of chocolate, however, at higher doses the effects turn negative. 
Bitter orange by itself, or within a mixture with other herbal components, had not delivered substantial adverse effects as an elevation in blood pressure or heart rate, or change electrocardiographic data, blood cell counts, serum chemistry, or urinalysis. Bitter orange by itself as well as in a mixture with additional ingredients was shown to elevate resting metabolic rate as well as energy expenditure. Also, modest raises in weight-loss had been noticed with bitter orange extract. There need to be longer term studies to further understand the efficacy of these products and to proclaim their safety under conditions such as these. 
Fat mass was substantially reduced in the yohimbine vs. placebo the assessment period following supplementation (7.1 +/- 2.2 vs. 9.2 +/- 1.9%; p < 0.05). There had been no alterations in exercise performance indicators (vertical jump, dribble and power test results, bench and leg press, shuttle run) during or between trials (p > 0.05). There had been no reports of adverse side effects from the yohimbine. Results from the study had suggested that yohimbine supplementation mixed with resistance training had not substantially changed body mass, performance indicators, or muscle mass in professional athletes. Yohimbine seems to be a useful strategy for weight-loss in athletes. 
- 1. Effects of coffee and caffeine anhydrous intake during creatine loading (2015). The Journal of Strength and Conditioning Research. November 16, 2016.
- 2. Psychopharmacology of theobromine in healthy volunteers (2014). Psychopharmacology Jourrnal. November 16, 2016.
- 3. A review of the human clinical studies involving Citrus aurantium (bitter orange) extract and its primary protoalkaloid p-synephrine (2012). International Journal of Medical Sciences. November 16, 2016.
- 4. Yohimbine: the effects on body composition and exercise performance in soccer players (2006). Research in Sports Medicine. November 16, 2016.
Fastin Side Effects:
Many people are seeking to lose weight by using supplements to help them in the process. While this is great in theory, there are always side-effects that need to be considered with any product. Users of Fastin have reported the following negative effects.
Rapid Heart Rate
Tachycardia is the medical term for an accelerated heart rate and can be very dangerous. The normal heart beats 60 to 100 times per minute, but when the pulse is increased, the racing beat can become life-threatening. Heart rate is controlled by electrical impulses sent throughout the heart chambers. 
What causes a rapid heart rate?
There area number of potential causes for a rapid heart rate including a exercise, a fever, stress, anxiety or reactions from medications or nutritional supplements. More serious causes include anemia, an overactive thyroid, heart damage or a heart attack. 
The inability to attain or sustain a deep sleep is known as sleeplessness or insomnia. It can also present as waking too early or being unable to go back to sleep. Chronic sleeplessness typically descrbes someone who has trouble sleeping three or more times per week.
What causes of sleeplessness?
Insomia is brought about by less serious issues such as stress or anxiety. It can also result from changes in diet, medication or supplements. Environmental issues such light, noise and temperature can be factors. Changes in sleep habits can negatively impact sleep, such as napping throughout the day. Jet lag can also disturb sleep for several nights.
Dry mouth occurs when your mouth is not producing normal amounts of saliva. Dry mouth is when skin both inside and around the mouth becomes overly dry resulting in sores, cracking of the lips, and roughening of the tongue.
What causes dry mouth?
Dry mouth can result from damage to nerves in the head or neck. It can also be attributed to autoimmune disorders in which white cells attack tear and salivary glands. Most dry mouth cases result from medications and nutritional supplements in the system. Side-effects must always be factored in when considering which weight-loss supplement to use. Users of Fastin have reported some that are quite significant.
Fastin is a strong fat burner from Hi-Tech Pharmaceuticals. The label is clear on the official website, but you won't find amounts for most of the ingredients. A proprietary blend is used to keep details of the formula with the company.
Fastin Ingredients and Supplement Facts
Serving Per Container: 60
|Amount per Serving||% DV|
|Proprietary Blend with ThermoRX||245mg||*|
|- Phenylethylamine HCL||*||*|
|- Methylsynephrine HCl||*||*|
|- Theobromine Anhydrous||*||*|
|- 1,3-Dimethylamine HCL||*||*|
|- Synephrine HCL||*||*|
|- N-Methyl-B-Phenylethylamine HCL||*||*|
|- Yohimbine HCL||*||*|
Other Ingredients: None
We dug deep into the Fastin ingredients to give you the details you need.
Caffeine anhydrous is a dehydrated form of caffeine that’s naturally found in coffee and tea.
What is it Supposed to Do?
Because it’s a stimulant, it’s thought to help boost the metabolism so you can burn more fat.
According to a study published in September 2007 in European Journal of Clinical Nutrition, “Only caffeine was thermogenic in the given dose and caused no haemodynamic side effects.”
Theobromine anhydrous is a dehydrated form of theobromine. It is the primary alkaloid found in chocolate, and is the chemical responsible for the “feel good” reaction we get when we eat chocolate.
What is it Supposed to Do?
Theobromine is used as a stimulant, a diuretic, and a vasodialator. It is a longer acting substance than caffeine.
According to a 2013 study published in Psychopharmacology, “Theobromine responses differed according to dose: it showed limited subjective effects at 250 mg and negative mood effects at higher doses. It also dose-dependently increased heart rate.”
Also known as bitter orange, this plant has stimulant qualities that make it similar to the now banned ephedra. Because of the potential for negative side effects, the National Collegiate Athletic Association (NCAA) considers it a banned substance.
What is it Supposed to Do?
It’s supposed to boost the metabolism to make it easier to loose weight. It affects the central nervous system and may increase heart rate and blood pressure.
According to a study published in a 2005 issue of The American Journal of Medicine, “Ephedra-free weight loss supplements have significant cardiovascular stimulant actions, similar to ephedra. These effects are not likely caused by C. aurantium alone.” That could mean other ingredients may be required for optimal effect.
The salt form of phenylethylamine, this chemical is used to improve mood and alertness, as well as assist with weight-loss. It is found in chocolate and is known as the “love drug.”
What is it Supposed to Do?
This chemical helps to increase dopamine levels and block the actions of dopamine receptors. Its stimulant nature makes it behave similar to amphetamines to raise the blood pressure and blood sugar levels, while also boosting metabolism.
This is an over-the-counter stimulant made from geranium plants.
What is it Supposed to Do?
It is supposed to help improve energy levels and promote feelings of well-being.
This is another form of phenylethylamine.
What is it Supposed to Do?
Like the other form of phenylethylamine found in the formula, it is supposed to help promote feelings of well-being.
This is an ephedrine alternative.
What is it Supposed to Do?
It’s a stimulant to boost metabolism and energy levels.
This is a form of yohimbe that is available as prescription drug in the United States. Yohimbe is an evergreen tree found in parts of Africa.
What is it Supposed to Do?
It’s supposed to help improve sex drive and function while taking an SSRI antidepressant medication, improve athletic performance and support weight-loss.
One that we have our eye one is Leptigen. It contains clinically-tested ingredients and supported by positive customer comments. Click above to learn more.