I'll leave my original review from a year ago below but I"m changing my rating from 3 to 5 stars for two big reasons.
1. My feet are in agony right now. This had been happening to me before I started taking benfotiamine and this was the first brand of it that I tried. It worked beautifully. A some point I ordered a different unknown brand and the pain returned so I went back on this one. Then months passed and again I ordered a cheaper but this time very well known brand in orange and white bottle and immediately the pain returned. I kept telling myself there is no way that it could be from switching brands. But it has become very obvious to me that this is what's happening again. I have no idea why Life Extension's benfotiamine is working but 2 other brands that I've tried didn't. It makes no sense but it is definitely the reality of the situation for me. It seems like this one blunts the effect of blood sugar on nerves and the others didn't.
2. As you can read in my old review at the end of this one, I was nervous about thiamine increasing cancer risk. After researching that I found out that it is true, if you take a regular dose thiamine supplement. But if you megadose thiamine, such as the amount in one of these pills, the pro cancer effect is actually reversed and thiamine becomes anti cancer.
I'm about to re order these and return the other brand I've been taking so I can go back to getting some relief, and get my confidence back that my nerves are being protected.
Original review:
I have to give 3 stars because I'm very unsure if this product after reading about thiamine's potential to make cancer grow fast. Evidently there are chemo agents designed to block thiamine for that reason. I've been taking this for months, just went through 2 bottles thinking I'm doing the best thing I can do to protect my nerves from the effects of high blood sugar. And although the studies show this works great for that maybe better than anything else and it's been used in Europe as a drug, learning about the cancer aspect scares me.
Google "benfotiamine cancer" and "thiamine cancer" if you want to read some of the articles I just read about that.
Update 10/7/2019
I'm still using this, I've repurchased 9 times. I wish it were cheaper but I can;t do without it. I'ts preventing a lot of bizarre symptoms which I could write a book on, but they come back whenever I start skipping doses.
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From the manufacturer
Cell energy and beyond
Benfotiamine is a fat-soluble form of vitamin B1 (thiamine) that supports healthy metabolism.
Say “no” to AGE-ing
Benfotiamine helps protect your body’s tissues against advanced glycation end products (AGEs), which are compounds that accumulate with age.
Free radical defense
Benfotiamine helps protect your body against oxidative stress.
All the B benefits
As a form of B1, benfotiamine also delivers the more well-known benefits of B, support for healthy energy, healthy memory and nervous system health.
Compare with similar items
This Item  Life Extension Mega Benfotiamine, 250 mg, a Fat-Soluble Form of thiamine, Healthy Metabolism, Ultra-bioavailable Vitamin B1, high Potency, Gluten-Free, Non-GMO, Vegetarian, 120 Capsules |  |  |  |  |  | |
| Price | -7% $21.00 List: $22.50 | $45.99 | -17% $24.89 List: $29.95 | $28.95 | -52% $13.06 List: $27.49 | $17.61 |
| Price Per Unit | $0.18 / Count | $1.98 / Ounce | $0.10 / Count | $3.62 / Ounce | $0.22 / Count | $0.15 / Count |
| Delivery | Get it as soon as Saturday, May 11 | Get it as soon as Saturday, May 11 | Get it as soon as Saturday, May 11 | Get it as soon as Saturday, May 11 | Get it as soon as Saturday, May 11 | Get it as soon as Saturday, May 11 |
| Customer Ratings | ||||||
| Value for money | ||||||
| Flavor | ||||||
| Easy to swallow | ||||||
| Pain relief | ||||||
| Sold By | Life Extension Buyers Club | Dr. Berg Products | eSupplements | Dr. Berg Products | Amazon.com | Amazon.com |
| keyword type | vitamin-b1-thiamine | sports-nutrition-endurance-and-energy-powders | alpha-lipoic-acid-nutritional-supplements | nutritional-yeast | vitamin-b1-thiamine | vitamin-b1-thiamine |
| form | Capsule | Powder | Capsule | Flake | Veggie Cap | Capsule |
| flavor | Unflavored | Raspberry & Lemon - 100 Servings | Unflavored | — | Unflavored | Unflavored |
| size | 120 Count (Pack of 1) | 100 Servings (Pack of 1) | 240 Count (Pack of 1) | 8.01 Ounce (Pack of 1) | 60 Count (Pack of 1) | 120 Count (Pack of 1) |
| weight | 0.21 pounds | 0.76 pounds | 6 ounces | 8 ounces | 0.12 pounds | 0.06 kilograms |
| age range | Adult | Adult | Adult | Adult | Adult | Adult |
| product benefit | Helps support healthy metabolism | Support Muscle Health, Energy Management | Inflammation Management | — | Metabolism Management | glucose metabolism |
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