|
|
|
Welcome to the Quality Counts. For those health conscious consumers and medical professionals that are looking to purchase nutritional supplements, vitamins, herbs, learning about medications, losing weight, health food, low carbs, high protein nutrition, and exercise, you have come to the right place. Quality Counts serves both the medical practitioner and consumer interested in nutritional therapy and alternative medicine.
Home >
Anti-aging Research > Vitamin A
Vitamin A
Specific Recommendations:
- carotenoids
- (beta carotene, a carotenoid, is converted to vitamin A as needed.
However, taking just one of over 600 carotenoids can cause a deficiency of
the others)
-
Vitamin A products at iHerb
General Information:
-
Vitamin A and Carotenoids - NIH
-
Vitamin A
- Vitacost Health Library
- Vitamin A - The Natural
Pharmacist
-
Vitamin A and
Pregnancy - thenutritionreporter.com
News & Research:
-
How
Embryos Regulate Vitamin A Derivatives: Too Much Or Too Little Linked To
Birth Defects - Science Daily, 11/19/07
-
Drug
Slows Prostate Tumor Growth By Keeping Vitamin A Active - Science Daily,
11/7/07 - "A novel compound that blocks the
breakdown of retinoic acid, derived from vitamin A, is a surprisingly
effective and "promiscuous" agent in treating animal models of human
prostate cancer ... Daily injections of the agent VN/14-1 resulted in up to
a 50 percent decrease in tumor volume in mice implanted with human prostate
cancer cells ... Vitamin A, when converted by the body into retinoic acid,
is known to be involved in maintaining the normal growth of cells, and other
research has shown that prostate cancer cells contain five to eight times
less retinoic acid than normal prostate cells"
-
Vitamin A Reduces Infant Deaths from Measles, Studies Confirm - Doctor's
Guide, 10/29/05
-
New findings on vitamin A's role in cancer prevention
- Nutra USA, 1/6/05
- Vitamin A Levels Affect Hip Fracture Risk -
Physician's Weekly, 10/4/04 - "women with the lowest concentrations of vitamin A had a 90% higher risk of
hip fracture. Those with the highest concentrations were twice as likely
as those with normal levels to sustain a hip fracture"
- Too Much or Too Little Vitamin A Raises Hip-Fracture Risk in Post-Menopausal
Women - Doctor's Guide, 6/24/03 - "the highest and lowest quintiles were at twice the risk of
hip fracture compared to the middle quintile ... without knowing the
vitamin A status of an individual, eliminating vitamin A supplements could
actually increase the number of vitamin A-deficient individuals, which would
put them at risk not only of hip fractures, but also for other health risks
associated with low vitamin A"
- Vitamin A
Safety - Dr. Janson's Newsletter, 2/03 - "what they did not mention was that those in the next to highest and middle
ranges had a significantly lower risk than those with lower blood levels.
The amounts in normal vitamin supplements appear to be quite safe ...
One problem with the latest study is that they measured blood levels just
once at the beginning of the study 30 years ago. They assessed dietary
intake with a questionnaire in only half of the subjects, when they were 20
years into the study. While this study gives cause for some concern, other
studies are contradictory, so we have to be careful before drawing firm
conclusions"
- Vitamin A Supplements Raise Risk Of Broken Bones -
Intelihealth, 1/22/03
- Vitamin A: Bone Poison? - WebMD, 1/22/03
- Watermelon
for Prostate Cancer? - Dr. Weil, 12/10/02 - "The body converts about 500 different carotenoids into vitamin A"
- Vitamin
A Supplementation Does Not Cause Osteoporosis -
New Hope Natural Media, 9/26/02
- Too Much or Too Little Vitamin Associated With Low BMD in Elderly
- Doctor's Guide, 8/16/02
- How Much
Vitamin A Is Safe? - Dr. Weil, 2/21/02
- Study: Vitamin A Helpful Vs. Disease -
Intelihealth, 1/7/02
- Study: Vitamin [A] Linked To Fractures -
Intelihealth, 1/2/01
-
Vitamin A, Steroids Could Help Keep Body Clocks in Sync - WebMD, 6/28/01
- "I think it will turn out that
vitamin A will be a novel signaling mechanism, and that it will play a role
maybe in [controlling] peripheral clocks [throughout the body]," says lead
author Peter McNamara, PhD."
-
Canceling Cancer: New Cancer Prevention Strategies on the Horizon -
WebMD, 3/26/01 - "an enzyme called
telomerase is important for the growth of most cancer cells but not so
crucial for the growth of normal cells ... By giving a compound similar to
vitamin A to a group of heavy smokers, they were able to reduce the amount
of telomerase activity. Their findings indicate that this compound might be
useful in the future to prevent lung cancer in former smokers"
- Vitamin
A : Safe at Intake of 10,000 IU - Council for Responsible Nutrition,
1/12/01
-
Some Fruits and Veggies Have Half the Vitamin A Once Thought - WebMD,
1/10/01
-
Report: Too Much Vitamin A Dangerous - Intelihealth, 1/10/01
-
Nontoxic Drug Shown To Help Reduce Return Of Breast Cancer -
Intelihealth, 11/3/99
- A Shield of Immunity - Nutrition Science News,
9/99
-
Study Finds High-Dose Vitamin A Safe For Eye Disease - Intelihealth,
4/16/99
- Too Much Vitamin A Poses Hip Fracture Risk -
Nutrition Science News, 3/99
- Moderate
Doses Of Vitamin A Do Not Pose Risk Of Birth Defects - Doctor's Guide,
7/22/97
Other possible vitamin A retailers:
Related Sites:
70513
|
