Contact Us

Biosential Inc.
119-660 Eglinton Ave East
Suite 531
Toronto, ON
M4G 2K2

phone: +1(416)421-7445
toll free: 1-800-735-4538
fax: +1(416)466-3432
email: info@biosential.com


Zenbev and RestBites are available at many fine Health Stores. Please call to determine a location in your area.

Retailers, Biosential products are distributed directly . Contact us if you are interested in carrying Zenbev and RestBites.

Toronto Area

Peaches & Green
1561 Bayview Avenue
Toronto, ON

The Big Carrot
348 Danforth Avenue
Toronto, ON

Shoppers Drug Mart
2047 Avenue Road
Toronto, ON

Foods for Life
2184-E Bloor Street West
Toronto, Ontario

Noah's Natural Foods
2395 Yonge Street
Toronto, ON

Nature's Emporium Wholistic Market
16655 Yonge Street,
Unit 27
Newmarket, Ontario

Nature's Source Inc.
40 Ronson Drive
Toronto, ON

Nature's Source Inc.
5029 Hurontario Street
Unit 2
Mississauga, ON

Wonder of Nature
2920 Bloor Street West
Toronto, ON

Noah's Natural Foods
322 Bloor Street West
Toronto, ON

Taste of Nature
380 Bloor Street West
Toronto, ON

Health Service Centre
489 Parliament Street
Toronto, ON

Durie Health Products
2221 Bloor Street West
Toronto, ON

Cobourg Health Shoppe
76 King Street West
Cobourg, ON

The Apple Market
2281 Camilla Road
Mississauga, ON

Tutti Frutti
64 Kensington Avenue
Toronto, ON

Ambrosia Natural Foods
55 Doncaster Avenue
Thornhill, Ontario

Peach Tree Health Foods
2239A Bloor Street West
Toronto, ON

Qi Natural Foods
1001 Eglinton Avenue West
Toronto, ON

Nature's Source Inc.
145 Ceremonial Drive
Mississauga, ON

Planet Organic Market
170 Lakeshore Road East
Mississauga, ON

Main Drug Mart (Remedx)
North York Medical Arts Bldg
1333 Sheppard Ave., East
North York, ON

Feel Good
129 King Street East
Oshawa, ON

Markie Pharmacy
1235 Bay Street
Toronto, ON

Nature's Counter
Westdale Mall
1151 Dundas Street West
Mississauga, ON

Nature's Counter
Central Parkway Mall
377 Burnhamthorpe Rd East
Mississauga, ON

Nature's Counter
North York City Centre
5150 Yonge Street
North York, ON

The Health Shoppe
1375 Yonge Street
Toronto, ON

Qi Natural Foods
710 Bloor Street West
Toronto, ON

Noah's Natural Foods
9121 Weston Road
Woodbridge, ON

Natural Life Health Market
30-7700 Bathurst Street
Thornhill, ON

Noah's Natural Foods
667 Yonge Street
Toronto, ON

Qi Natural Foods
219 Roncesvalles Avenue
Toronto, ON

Harmony Health Naturopathic Clinic
207321 Hwy 9
R R #5
Orangeville, ON

Supplements Plus
2304 Bloor Street West
Toronto, ON

Ervanaria Victoria
920 Dundas Street West
Toronto, ON

Life Essential Health Store
1923 Eglinton Avenue West
Toronto, ON

Noah's Natural Foods
667 Yonge Street
Toronto, ON

Port Credit Village Pharmacy
225 Lakeshore Road East
Mississauga, ON

Today's Natural Solutions
3050 Garden Street
Unit 106
Whitby, ON

The Health Shop
41A Charles Avenue West
Toronto, Ontario

Jo Anne's Place
1260 Landsdowne St. West
Peterborough, ON

Smith's Pharmacy
3463 Yonge St.
Toronto, ON

Vibrant Lifestyle
171 East Liberty Rd. Unit 141
Toronto, ON

A Bed of Roses Medispa
11 Victoria Street
Markham, ON
L6C 1A7

Green Natural's
689 Mount Pleasant Rd
Toronto, ON
M4S 2N2

Health Palace
114-3601 Hwy 7
Markham, ON
L3R 0M3

5990 16th Ave., Unit 220
Markham, ON
L3P 7R2

Healthy Planet
8567 McCowan Road, Unit 2
Markham, ON
L3P 1W9

Healthy Planet
14-1725 Kingston Rd.
Pickering, ON
L1V 4L9

Healthy Planet
588 Sheppard Ave., W.
Toronto, ON
M3H 2S1

Healthy Planet
Parkway Mall, 85 Ellesmere Rd.
Scarborough, ON
M1R 4B7

Hooper's Pharmacy
2136 Queen Street East
Toronto, ON
M4E 1E3

Nature's Health Food
3003 Danforth Ave., E.
East York, ON
M4C 1M9

Noah's Natural Foods
9121 Weston
Woodbridge, ON
L4L 1A6

Nutrition House Extra
Heartland Town Centre, 5885 Rodeo Dr.
Mississauga, ON
L5R 4C1

Nutrition Plus
42 Maple Ave.
Barrie, ON
L4N 1R8

Rosedale General Store
1075 Yonge Street
Toronto, ON
M4W 2L2

Tara Natural Foods
81 Princess St.
Kingston, ON
K7L 1A6

The Food Depot
14 Jutland Rd
Etobicoke, ON
M8Z 2G9

The Herbal Pathway
1822 Whites Rd.
Pickering, ON
L1V 4M1

S&H Health Foods
South Common Centre, 2150 Barnhamthorpe St. W.
Mississauga, ON
L5L 3A2

A1 Nutrition
121 King St., W., Unit 101
Toronto, ON
M5H 3T9

Hamilton Area

Burlington Health Foods
3350 Fairview Street
Burlington , ON

Nature's Source Inc.
2391 Trafalgar Road
Oakville, ON

Goodness Me Natural Food Market
1000 Upper Gage Road
Hamilton, ON

Goodness Me!
3455 Fairview Street
Burlington, ON

Goodness Me!
176 Locke Street South
Hamilton, ON

The Vitamin Store
255 Dundas Street East
Waterdown, ON

Bulk Food Warehouse
516 Plains Road East
Burlington, ON

Goodness Me!
74 Hamilton Street North
Waterdown, ON

BJ's Nutrition
720 Upper James St
Hamilton, ON
L9C 2Z9

The Vitamin Store
459 Guelph Line
Burlington, ON
L7R 3L8

Niagara Peninsula

Naturally Healthy Health Foods
4025 Dorchester Road
Niagara Falls, ON

The Peanut Mill
4-191 Welland Avenue
St. Catharines, ON

Vita Health Foods
3714 Portage Road
Commisso Plaza
Niagara Falls, ON

Health Wise
Seaway Mall
800 Niagara Street
Welland, ON

Ottawa Area

Rainbow Foods
1487 Richmond Road
Ottawa, ON

Mother Earth Natural Health
747D Richmond Road
Ottawa, ON

Western Ontario

Lyn-Dys Health Foods
1016 Oxford Street East
London , ON

The Gentle Rain
30 Rebecca Street
Stratford, ON

Basic Bulk and Natural Foods
11-385 Frederik St.
Kitchener, ON

New Age Health Foods
122 Wyndham Street North
Guelph, ON

Fiddleheads Health & Nutrition
438 Highland Road West
Kitchener, ON

480 Hespler Rd.
Cambridge, ON

Elly Boersema Health Foods
3261 Mullifarry Drive
Strathroy, ON

Enchie Organics
2001 Provincial Rd.
Windsor, ON

Health Essentials
161 Forest Avenue
St. Thomas, ON

Healthward Bound
40 East Street
Goderich, ON

Rexall Pharma Plus
67 Kingston Street
Goderich, ON

Salubrity Natural Health
503 Sandwich Street South
Amherstburg, ON

Spartan Nutrition
127 Talbot Street West
Leamington, ON

Fiddleheads Health & Nutrition
450 Columbia St. W.
Waterloo, ON
N2T 2W1

Fiddleheads Health & Nutrition
25 Bruce St.
Kitchener, ON
N2B 1Y4

Goodness Me!
605 West St.
Brantford, ON
N3R 7C5

Northern Ontario

Health Hut
2100 Metro Road North
Jackson's Point, ON

Nutrition Plus
42 Maple Ave.
Barrie, ON
L4N 1R8


Aliments Naturels L'Eau Vive
248, rue Saint-Georges
Mont-Saint-Hilaire, Quebec

Docteur & Mere Nature
315, boulevard Saint-Martin Ouest
Laval, Quebec

Nova Scotia

The Healthy Bug
3514 Joseph Howe Dr.
Halifax, NS
B3L 4H6


Aviva Natural Health Solutions
1224 St. James St.
Winnipeg, MB
R3H 0L1

Good 'n' Natural
116 Park Road West
Unit A
Steinbach, Manitoba

Honeybee Health Foods
1643 Saskatchewan Ave W
Portage La Prairie, MB
R1N 0R4


Vitamins First
2136-33 Avenue SW
Calgary, Alberta

Oliver Health Foods
2045 Mayor MacGrath Drive South
Unit 107
Lethbridge, Alberta

Nutter's Bulk & Natural Foods
622 Patricia St., PO Box 1629
Jasper, AB
T0E 1E0

Nutter's Bulk & Natural Foods
900 Railway Ave.
Canmore, AB
T1W 1P4

The Healthy Hut
126-2nd Avenue, PO Box 1614
Cochrane, AB
T4C 1B5

British Columbia

Longevita Scientific Inc.
1101-4500 Kingsway
Burnaby , BC

Longevita Scientific Inc.
3230-8888 Odlin Cresc.
Richmond, BC

Health on the Drive
1458 Commercial Drive
Vancouver, BC

Health Works
3120 Edgemont Blvd
North Vancouver, BC

1-281 East Island Highway
Parksville, BC

Lynn's Vitamin Gallery
4-180 Central Rd.
Duncan, BC
V9L 4X3

The Vitamin Shop
1212 Broad St.
Victoria, BC
V8W 2A5

Biosential Inc

Biosential Inc. was founded in 1997 by Craig Hudson, MD and his wife Susan Hudson and is based in Toronto, Ontario. In the past 10 years Biosential has grown from an idea that wouldn’t go away to a global entity dedicated to developing, testing, manufacturing and distributing quality functional foods. With a view to treat the body using food where possible instead of medications, these functional foods take advantage of established scientific advances and tweak them through a nutritional rather than chemical lens.

In a health climate that often polarizes the medical and the natural, principals Craig & Susan Hudson operate from an appreciation of the advances and potential of medical research and seek to leverage the benefits of modern science with a healthy respect for the nutritional needs of the whole person.


After spending the early years of his medical career in research at the Clarke Institute of Psychiatry, Craig Hudson left academia to pursue the quiet life of a psychiatrist in Stratford, Ontario. He was struck immediately by the number of people complaining of sleeping problems and wishing to escape a dependency on sleep medications. From his knowledge of the scientific literature he was aware of the benefits of synthetic tryptophan, if used properly, in the treatment of insomnia, anxiety, depression and chronic pain. Many people, however, could not follow through with the elaborate instructions in order to achieve the desired results of synthetic tryptophan since it can only bring its benefit under certain conditions.

Dr. Hudson surmised that if all these factors were rolled into a food bar, the effects could be achieved in a simple, more natural way, the way nature really intended. Tryptophan is an essential amino acid we need to get from food, so food ingredients should be the vehicle by which it is introduced to the body. The first prototype, the ZZZBar, was developed by Susan in their Stratford kitchen. It looked and tasted pretty terrible but it worked and was the beginning of a novel food approach to treating common but debilitating Central Nervous System complaints.

In 2004, after 7 years in research and development Biosential’s first product, Zenbev® Drink Mix, was launched in Canada. Zenbev is an organic, powdered beverage mix that combines a strategic protein with a carbohydrate to deliver a food source of tryptophan efficiently to the brain. The protein is derived from pumpkinseeds which have been crushed to remove their oil and milled to a fine powder which further concentrates the tryptophan but does not alter its biochemical structure. The carbohydrate source is dextrose providing the open doorway for the tryptophan to cross the blood brain barrier.

Once tryptophan is in the brain it responds to the available light. In daytime conditions tryptophan naturally metabolizes to serotonin which lowers anxiety. In darkness tryptophan metabolizes to serotonin and then to melatonin, allowing the brain to produce its own sleep hormone.

This formulation was tested in a clinical study where it was compared to synthetic tryptophan with carbohydrate and to a placebo. The formulation performed comparably to the effect of synthetic tryptophan on most variables and actually out-performed the drug in reducing the number of night-time awakenings and the amount of time subjects were awake in the middle of the night (Protein source tryptophan versus pharmaceutical grade tryptophan as an efficacious treatment for chronic insomnia, Nutritional Neuroscience, April 2005). Unlike synthetic tryptophan, natural source tryptophan is safe and approved for sale in Canada in accordance with the Natural Health Product (NHP) Directorate. Similar approval has been sought and granted in Europe and the USA.

Biosential has invested heavily in research and development beginning with laboratory studies conducted at the Guelph Food Technology Centre prior to publication in peer-reviewed journals. Early on, the principals of Biosential recognized that investment in R&D must be protected by a significant investment in Intellectual Property defence. Biosential has been granted 4 US patents, 3 Canadian patents, 2 South African patents, and one in Australia, China, New Zealand, India and Hong Kong. Examination of additional international patents has progressed well with patents imminent for Australia, Europe Japan, Korea, Mexico and South America. Biosential’s patents offer broad protection with respect to composition as well as methods of use claims. Zenbev® is Certified Organic by QAI.

Zenbev® Drink Mix was launched in Ontario in September 2004 and is now sold in over 200 health stores in Canada. In the spring of 2005 Zenbev® Drink Mix was launched in Ireland and is now sold in Belgium, Denmark, Ireland, Germany, Norway, and Sweden. New markets are currently being explored and evaluated throughout the world.

Mission Statement

Created by Nature. Delivered by Science.

Biosential aims to develop natural food products blending the best of nature with the latest science. By enhancing, rather than altering basic structures available in botanicals, Biosential combines natural ingredients in a way that can be most efficiently utilized by our body in the context of the world in which we live. From idea inception to substantiation via rigorous clinical research, the goal is harmony: body, mind, science.

About Dr. Craig Hudson, M.D.

Chief Executive Officer & Chief Research Officer

Dr. Hudson received his medical degree and specialist training in psychiatry from the University of Toronto. After graduation he received the prestigious Medical Research Clinician Scientist Award, which allowed for three further years of post-graduate training in advanced research laboratory techniques including biochemistry as well as molecular genetic techniques. In 1996, he was recruited by Stratford General Hospital to lead the redevelopment of their department of psychiatry and is the former Chief of Staff of that hospital. His research into Central Nervous System (CNS) signaling systems is widely quoted in the medical literature and forms the basis of the Company’s product development.

Dr. Hudson founded Biosential Inc. in 1997 and is responsible for idea development, intellectual property protection, and research direction. Dr. Hudson is also jointly in charge of the overall direction of the Company and heads up partnership development and discussions. He works with the Scientific Advisory Board on critical review and assessment of product development and testing.

Frequently Asked Questions

Is there a risk of becoming dependent on Zenbev™ to fall asleep?

No. Almost all sleep drugs are associated with either dependence (the need to continue with the medication or the experience of “rebound” insomnia when it is discontinued) or tolerance (requiring an increased dosage to maintain the same effect) because these drugs override the brain’s natural sleep chemistry. Zenbev does not cause dependence or tolerance because it works with the brain’s natural sleep chemistry. It is the brain that decides how much is required and when. As a result the normal brain chemistry is maintained.

What is it in Zenbev that makes it work?

Zenbev is a natural source of tryptophan, the amino acid found in milk and turkey. Once in the brain, tryptophan becomes serotonin and, in turn, melatonin. This conversion to melatonin from tryptophan is light-sensitive. That is to say, tryptophan only becomes melatonin if it is dark; otherwise it remains as serotonin, a chemical that helps you to relax but does not make you fall asleep. Therefore, if taken during the day, Zenbev helps alleviate anxiety, depression and other stress-related clinical states. If taken at night, Zenbev is a powerful ally against insomnia. Zenbev is specially formulated with all-natural ingredients that have several advantages over synthetic derivatives such as prescription tryptophan or over-the-counter (OTC) 5-HTP or melatonin. These drug equivalents can produce much more serotonin or melatonin than the brain needs. When there is an over-production, side effects such as daytime sleepiness can occur.

Isn’t tryptophan banned by the FDA, and can it be taken safely?

Tryptophan is an essential amino acid, meaning that the body cannot produce it and must ingest it through a food source. Our bodies require tryptophan as the precursor to serotonin, a hormone that regulates sleep, mood and appetite. 15-years ago, pharmaceutical-grade tryptophan was banned by the FDA due to the contamination of a batch synthetically sourced from genetically modifying a bacterium. This process was discontinued and synthetic tryptophan has remained available by prescription in Canada. Zenbev, however, is comprised of a natural source of tryptophan derived from organic pumpkin seeds, and formulated to be easily assimilated by the body. According to Health Canada, amino acids present in a protein configuration are not considered to be drugs; and therefore would not be considered to be subject to special measures as per the DIN (Drug Identification Number) Enforcement Directive and the Therapeutic Products Compliance Guide.

Is Zenbev a drug?

No. It is an all natural food made from organic pumpkin seeds, dextrose and rice starch.

How much tryptophan is in a serving of Zenbev?

The amount of tryptophan ingested depends on the amount of Zenbev required. We recommend starting at 1-tablespoon and increasing the dosage as necessary. Most clients report that 1-2 tablespoons is sufficient. One should be aware that at more then 4-tablespoons, the dosage of tryptophan can be greater than 250 mg. This should be more than adequate for most clients since the inventive formulation of Zenbev allows the body to utilize the protein source of tryptophan very efficiently,

What are high glycemic index foods?

Recent fad diets have claimed that eating too many carbohydrates can lead to high insulin levels, resulting in health issues such as obesity and diabetes. Foods that score higher than 70 on the glycemic index (ie. potatoes, parsnips and donuts) are high GI foods, the reference food being pure glucose or white sugar at 100. High GI foods provide bursts of energy that may be followed quickly by blood sugar reductions and hunger. If taken in moderation, some high GI foods can be beneficial and should not be avoided altogether. However, overly processed foods containing excess sugar should be limited. We can make an effort to become aware of the glycemic reaction that certain foods cause and therefore make better-balanced food choices.

Zenbev’s special formula includes a small amount of organic dextrose, a high GI food that serves the specific function of binding to all the amino acids in the protein chain except for tryptophan and shunting them away. Tryptophan is then allowed efficient access across the blood brain barrier (BBB), thus contributing to Zenbev’s effectiveness. Diabetics should be cautious when taking Zenbev and refer to the nutritional panel on the label.

Does Zenbev have side effects?

It takes about thirty minutes for circulating melatonin to become inactive after the sun rises or lights are turned on. During that time there may be drowsiness which subsides and does not interfere with daytime functioning.

Zenbev contains organic dextrose. Diabetics taking Zenbev should be aware that 2 tablespoons contains the same amount of carbohydrate as one slice of dry toast.

Finally, patients taking drugs that already cause drowsiness, such as antidepressants (pharmaceutical grade or natural such a St. John’s Wort) or lithium, should avoid Zenbev.

Will It Knock Me Out?

No. Zenbev does not override the brain’s own natural sleep chemistry; it allows the brain to produce as much or as little melatonin as it needs. As noted above, melatonin takes approximately ½ hour to leave the body after first light, so there may be a hold-over sleepiness of about that amount of time.

How does Zenbev compare to other drugs for treating insomnia?

Zenbev is the only sleep aid that works within the brain’s own natural sleep chemistry. It allows the body to produce melatonin but does not override the natural sleep chemistry as melatonin itself might. It also enhances the 5-stages of sleep whereas other sleep aids including prescription drugs and OTC antihistamines actually suppress deep sleep (stages 3&4) as well as REM (dream) sleep.

Can I use Zenbev every day or night?

Yes, but it may not be necessary since there is a positive effect for a few days after one stops Zenbev. The best rule of thumb is that it takes a few doses before its optimal benefit is seen and it continues to work for a few days/ nights after it was last taken. One way of optimizing this benefit is to take Zenbev for 5-7 days/ nights and then stop it for 2-3 days/ nights. If you prefer to take it every day, however, there is no difficulty with that approach.

Does it need to be refrigerated?

No. Zenbev should be stored in a dry cool space. Zenbev is made from ingredients that are stable, with an expected shelf-life of several years.

How long will a jar last?

One jar should last about 30-days, assuming a dosage of two-tablespoons per day. It may last longer if taken on an intermittent schedule or at a lower dosage. It will not last 30-days if taken at a higher dosage on a daily schedule.

What if it doesn’t work?

It takes anywhere from three days/nights to one week to notice the effects so it is important to persevere and give Zenbev a good long trial. If you get to the end of the jar and are feeling that it is not helping you or if you are unsatisfied with Zenbev for any reason, please return it to the place where you purchased it, with your receipt, for a full refund. If you have any questions about Zenbev as you are taking it feel free to email us at info@biosential.com

Can Zenbev help all sleep or anxiety problems?

No. Zenbev is effective for the vast majority of people suffering from insomnia and/or those who feel stressed but will not work for a small number of people who may suffer from disorders such as sleep apnea or restless leg syndrome. Again, Dr. Hudson can help clarify the differences between insomnia and serious sleep disorders. You may contact him at info@biosential.com.

Zenbev is highly effective for stress-related problems such as anxiety and depression if resulting from a lack of serotonin. Zenbev is specially formulated to deliver tryptophan, which is the precursor for serotonin, in a way that can be easily assimilated by the body. Those with long-term cases of depression should also consult a medical professional.

Who should avoid taking Zenbev?

Those who plan to drive or operate heavy machinery at night should not take Zenbev before doing so. If you are pregnant or nursing a child, you should consult your physician. Those taking antidepressants, including St. John’s Wort and/or lithium should not take Zenbev. If you are diabetic as mentioned earlier, please consult the nutritional panel and your doctor.