Fastin Review

Editor's Review: 3.4 / 5.0

What You Should Know

Click Here To See Our Highest Rated Review

Fastin 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. 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. 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.


We 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. 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 Features

Fastin 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.

See Our Featured Diet


  • 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.


  • 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.


Fastin may help some that are extremely overweight and have not seen success with diet and exercise alone. However, we prefer a diet supplement that contains a safe but effective fat burner and an appetite suppressant for best results.

GD Star Rating

16 User Reviews About Fastin
Leave comments below

  • 1

    I have stage 4 renal failure. Is this product safe for me?


  • 2
    Angela Mannon

    I need to lose about 30 lbs. The one I have used before is now off the market. I need the extra help to get me back on track. Please email any information on this. I have heard the changed some things and it doesn’t work like it did. Can you clear that up? Thank you Angela Mannon


  • 3

    Can you buy Fastin off the counter without a script? HOw much are they and do they really make one loose weight? I just ordered I thought it had phertermine in it and it doesn’t. I bought 6 bottles from the computer. It is like eating candy–IT HAS NO EFFECTS!!!!!!!!!!!!!!!!!!!!!!!!!!! DOes Fastin have phetermine in it? ANd where can one purchase it?


  • 4
    April Jones

    Is Fastin- original formula still available at GNC either in stores – preferably or via to order? I was under impression it was pulled from shelves? Someone please respond via Email thank you! Love GNC :)


  • 5
    Alicia Smith

    I started taking Fastin three days ago. I have not weighed yet, but what I can tell you is I have more energy than I did and I am not very hungry. I do take it twice a day, but I do not take the recommended dosage. Right now, I am taking a half a pill around 8:30 and the other half around 12:30 or 1:00. I can tell a big difference in my appetite which is what I was looking for. It also gives me a push to work harder during my workouts. I have about 15-20 poinds left to use and I am hoping that this helps me achieve my goal. In the past, I have taken the prescription Phentermine whiuch worked for a while but the last time I got the pills it didn’t appear to have the same effect on me. So I went on a search for other supplements and I can honeslty day that this is the first one that has given me both an appetite supressant and the energy I need. If you are looking for a good product for the money…this is it!



    It has been several months since you wrote this review are you still taking the pill and if so what if any changes have you experienced.


  • 6

    I have been taking this product for 5 days and I have had increased energy as well as decrease appetite I have to force myself to eat even one meal a day. I only take one in the morning and one at lunch. this morning I had major issues i think it was dangerously low blood sugar as I have only been eating 1 healthy choice meal a day. I was down for most of the day I did not take the second pill and I will for now on eat a protien bar, egg, fruit or oatmeal before I take the pill in the morning. I have on the plus side lost 10 lbs so far but at what cost? I was freaked out this morning and so worried I was going to go into cardiac arrest. Force yourself to eat protien and veggies through out the day.


  • 7

    This stuff does jack you up. I’m used to drinking about six diet sodas per day, but this is unbelievable (and not necessarily a good thing.) I’m shaking like a leaf and nauseated unbelievably.


  • 8

    I just took my first dose – two tablets of this Fastin supplement upon waking off an afternoon nap and then trying to see if it would jack me up like speed. As long time ago I used to abused PEA or Phenylethylamine HCL + Deplin (an MAO Inhibitor) that I would stay awake for days just like someone on methamphetamine. And that lead me to go into the delusional mode and my roommate called an ambulance that they strapped down onto a hospital bed as a result of overdoing Phenylethylamine HCL plus Deplin. Phenylethylamine HCL breaks down in your stomach but Deplin can prevent it from doing so leading to REAL amphetamines release into the brains creating powerful euphoria and energizing effects. Back to the story, after taking my first dose of Fastin on an empty stomach and it barely got me out of bed just like drinking two cups of coffee. No euphoria. No “high class” meth-like energizing effects. The overall effect is neutral and I’m still craving for foods. Perhaps adding the drug Deplin to this product can create mind boggling effects.


    Funk Shunning

    You stupid fucker, maybe you will jack your going nowhere self to the freezer in a nice big Baggie. You suck little nowhere man. You sound like such an idiot, you really do. This is not the place for your adolescent crap. Go back to the basement of your parents house where you live, at least get a paper route.


  • 9

    i bought some from kroger and i opened iot and the pill came out like a pile of wet sand. wtf??



    The pills are highly sensitive to heat/light exposure, causing them to turn a slight brownish tinge and become VERY brittle. It does not harm the effectiveness of the drug. But if you just bought it, it was probably sitting on the shelf for some time. Just return it and attempt to get a fresher bottle.


  • 10

    severe side effects similar to heart attack/stomach virus due to the vomiting


  • 11

    I found it at my grocery store, Kroger. $25 for 20 pills.


  • 12
    Bernice Tweed

    I want to order some of the fastin diet pills


    Your Name

    It causes jitters


Have a comment or question about Fastin?