Your Cart is Empty
But it doesn't have to be.
Continue Shopping.
Added to Cart
Cart Total:
Customers Also Bought:

Source Naturals, B-1, High Potency, 500 mg, 100 Tablets

Our Price:
You Save:
$7.59 (46)
  • Volume Discount
  • Buy 2+
    Save 5%
Earn 10% Loyalty Credit ?

This product is already in your Wish List.

View Wish List

This product is now in your Wish List.

Sorry, this product is no longer in stock.

In Stock
  • Expiration Date: Aug 2020
  • Shipping Weight: 0.41 lbs (0.19 kg)
  • Product Code: SNS-00888
  • UPC Code: 021078008880
  • Package Quantity: 100 Tablets
  • Dimensions: 2.4 x 2.4 x 4.4 in, 0.35 lbs (0.16 kg)
Bundle Offer
Save $4.00 when you purchase these items today for only $13.86
Total: $17.86
Combo Discount: - $4.00
Together: $13.86

Sorry, this product is no longer in stock.

Product Overview


  • Vitamin Supplement

B1 is intimately involved in many aspects of nerve health and function. The active co-enzyme form of B-1, thiamin pyrophosphate (TPP), is necessary for energy production and is essential for the formation of acetylcholine, a major neurotransmitter. Magnesium plays a role in neuromuscular transmission and activity, promoting muscle relaxation. A highly processed "junk food" diet, excessive alcohol intake, and exhaustive exercise may increase the need for B-1.

Suggested Use

1 tablet daily

Other Ingredients

Stearic acid, modified cellulose gum, acacia gum, magnesium stearate, ans silica.

Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives or artificial color, flavor or fragrance.


Note: If you are pregnant, may become pregnant or breastfeeding, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 1 Tablet
  Amount Per Serving %DV
Thiamin (vitamin B-1) 500 mg 33,333%
Magnesium (as magnesium citrate, malate, oxide & succinate) 100 mg 25%
iHerb Customer Reviews

just what we needed

Posted by 5533829222224871673 on Aug 12, 2016

My husband uses these every night, they help him sleep. They were not available locally so I searched and found your company and we have been very satisfied and appreciate the reminders.

Verified Purchase

Was this review helpful to you?

Thyroid Help!!

Posted by Reviewer3247496 on May 02, 2014

Ordered this after reading that Hashimoto's patients or (low thyroid) patients helped with energy!! Initially did..but after the 'Coxsackie' virus and some post viral fatigue I couldn't tell anymore. Not to mention 'allergies' are a problem now....grrrrr. Will continue to take it as I know B1 or Thiamine is so important to energy production.

Verified Purchase

Was this review helpful to you?


Posted by 4871441214480765874 on Mar 28, 2014


Verified Purchase

Was this review helpful to you?

big pills

Posted by 5371705003315761068 on Mar 27, 2014

I bought this to repel mosquitos, it seems to work so far & the great thing about these is the pills & mg are big enough to cut in two! Makes the bottle last longer. great price cant beat it

Verified Purchase

Was this review helpful to you?

For fibro energy

Posted by 5619461052993656923 on Feb 27, 2014

I have fibromyalgia and have been testing various possibilities of supplements that are said to help with the fatigue. I have found that taking high dose vitamin b1 has made a marked difference. I take 4 tablets a day, divided throughout the morning, and it took around 3 weeks to clearly notice the improvement.

Verified Purchase

Was this review helpful to you?