Well, the short answer is – there is no such supplement. As of February 2017 GNC doesn’t offer any own stacks based on or including D-Aspartic acid. However there is a GNC testosterone boosting stack being sold, just it doesn’t contain DAA. If you’re interested specifically in pure d-aspartic acid or DAA based stack, there are plenty supplements offered by other manufacturers.
Why there is no D-Aspartic Acid GNC supplement?
I’m neither affiliated with GNC, nor do I work for them, so my answer to this question is an educated guess. In the recent years the results of DAA research became inconclusive. Some studies lead by D’Anielli indicate that DAA is effective in boosting testosterone and luteinizing hormone levels. The study subjects were men, both sub-fertile and with normal testosterone levels and male rats. Other studies lead by Willoughby in which test subjects were young male athletes didn’t confirm the claims made about the DAA benefits. Read more about the research behind DAA here.
In consequence some manufacturers dropped the DAA from their product lines. As mentioned GNC doesn’t use it for their own stacks. However there are testosterone boosting supplements in the GNC product line.
What are alternatives to D-Aspartic Acid?
There are many testosterone boosters and libido enhancers, both single supplements and supplement stacks, e.g.:
- Fenugreek seed extract, Testofen is a libido enhancer and a potential testosterone booster (link to a human study). More about fenugreek and Testofen here. Supplement available here.
- Horny goat weed extract is an aphrodisiac known from Traditional Chinese Medicine. The results of lab tests performed on rats indicate that icariin (a compound found in horny goat weed) supplementation raises testosterone levels (read the studies here and here). However up till now no research on humans. Supplement available here.
- Mucuna pruriens (velvet bean) is a natural herbal supplement known from Indian herbal medicine, Ayurveda. It is a good source of a compound called L-Dopa. According to the studies (read here and here) mucuna increases testosterone levels if they are too low, but not beyond normal levels. Supplement available here.
- and many more.
However it must be noted that the research on testosterone boosters and libido enhancers is still in its early phase. We don’t know all the side effects of plant extracts and supplements. Use your sense and be reasonable when taking these products. Take the claims of manufacturers with a pinch of salt. If you don’t feel good stop taking it.
What should you buy instead of GNC d-aspartic acid?
If you would like to buy a testosterone booster from GNC, you will be probably interested in “GNC Men’s Healthy Testosterone” supplement. It is a supplement stack supporting four body functions:
- testosterone, hormone and sexual health,
- lean muscle,
- circulatory pump,
- energy and metabolism.
The testosterone, hormone and sexual health support ingredients are fenugreek seed extract, MyTosterone blend (a combination of the carotenoid astaxanthin from Haematococcus pluvialis and Saw Palmetto berry lipid extract from Serenoa repens), tribulus terrestris and DHEA (dehydroepiandrosterone).
The disadvantage is of course that you take (and pay for) a supplement stack.
If you’d rather buy a simple pure d-aspartic acid, you have a multiple choices at Amazon.com e.g. DAA from AI Sports or from Nutricost. They have both four and a half stars out of five at Amazon, are not overpriced and the both companies are a reputable manufacturers.