Disclaimer: The information in this article is provided strictly for educational purposes. RAD140 and LGD-4033 are sold for research purposes only and are not approved for human consumption. Always follow applicable laws and guidelines in your country or region.
Introduction
When it comes to selective androgen receptor modulators (SARMs), two names dominate the muscle-building conversation: RAD140 (Testolone) and LGD-4033 (Ligandrol). Both are widely studied for their ability to promote lean muscle growth without the same level of androgenic side effects associated with anabolic steroids.
But when you’re comparing these two SARMs from a research perspective, which one comes out on top for muscle gains? Let’s break down the evidence.
Muscle Gains: What Research Shows
RAD140 and LGD-4033 work through similar mechanisms — they bind to androgen receptors in muscle and bone tissue, triggering anabolic activity. However, subtle differences in their potency and selectivity can influence outcomes.
RAD140 has been reported in early studies to demonstrate a higher anabolic-to-androgenic ratio, meaning it may offer more pronounced lean mass gains relative to potential androgenic side effects. Anecdotal research feedback often notes a rapid increase in strength and performance within weeks.
LGD-4033, on the other hand, has been the subject of more formal human trials. A well-known study showed that even at low doses (1mg daily) for 21 days, healthy men gained an average of 1.21 kg of lean body mass without significant fat gain. This gives LGD-4033 an edge in documented human data.
Bottom line on gains:
RAD140 tends to be associated with faster, more aggressive strength increases and lean muscle growth in shorter timeframes.
LGD-4033 may produce slightly slower but highly consistent and well-documented gains in lean mass.
Strength vs. Size
From a research perspective, RAD140 often excels in strength output improvements, which can indirectly support muscle growth through increased training capacity. LGD-4033 tends to lean toward pure size gains with slightly less reported impact on raw strength compared to RAD140.
Side Effects: A Quick Comparison
While neither compound is free of risks, both are generally considered to have fewer androgenic side effects than anabolic steroids. That said:
RAD140 has been linked in research feedback to mild testosterone suppression, temporary insomnia, and occasional headaches.
LGD-4033 appears to have a slightly greater impact on testosterone suppression, particularly at higher doses or longer durations, making post-cycle research a common consideration.
Read Next: RAD140 vs. Testosterone: Which Offers Better Research Results?
Hormonal Impact
Both RAD140 and LGD-4033 can temporarily suppress endogenous testosterone in research models. LGD-4033 may show stronger suppression per mg compared to RAD140, although suppression from RAD140 can still be significant over time.
This is why research often includes follow-up studies into recovery compounds such as Enclomiphene (link internally to your Enclomiphene blog/product page).
Legal & Research Status
In most regions, both RAD140 and LGD-4033 are legal to purchase for laboratory research purposes but are not approved for human use. Competitive athletes should note that both compounds are listed on the World Anti-Doping Agency’s (WADA) prohibited substances list.
Which One Wins?
From a research standpoint:
For rapid, noticeable performance and strength increases: RAD140 often comes out ahead.
For steady, documented lean mass growth with human trial backing: LGD-4033 has the edge.
The “better” SARM will depend entirely on the research goals being studied. Many researchers investigate both (Golden Stack), either sequentially or comparatively, to gain a full picture of anabolic potential.
Where to Source for Research
If you require a credible source for RAD140 or LGD-4033 for legitimate research purposes, Affordable Nutrition offers lab-tested SARMs with transparent quality control. Products are supplied strictly for research use only and are not intended for human consumption.
Have you researched Ostarine as an alternative? Side Effects and Research Insights of Ostarine