HMB Butyrate Plus

What Is HMB?

HMB is short for beta-hydroxy beta-methylbutyrate, a small molecule the body makes when it breaks down leucine. Only a sliver of the leucine you eat ends up this way. The formula pairs it with calcium and vitamin D3, and lists 1,000 mg of HMB per serving.

How It Works in the Body

Leucine is an essential amino acid and a signal as much as a building block. The body strips its nitrogen to make KIC, and an enzyme in the cell fluid turns part of that into HMB. HMB acts on the same signaling route leucine uses to tell muscle to build protein.

The other two actives have settled roles. Calcium is the ion that triggers a muscle fiber to contract, and vitamin D3 governs how much calcium crosses the gut wall.

What It Supports

• Lean muscle: HMB comes from leucine, the amino acid that signals muscle protein synthesis, so it plays a role in muscle protein turnover.
• Muscle contraction: Calcium is the trigger every muscle fiber waits for, and it supports normal muscle function.
• Calcium absorption: Vitamin D3 is what the gut uses to take calcium in, so it helps maintain normal bone mineralization.
• Training: HMB has been a fixture of resistance-training nutrition since it moved out of animal science decades ago.

Who It May Suit

Made for people doing resistance work, and for older adults who want to hold on to lean mass as the years pass. The calcium and D3 suit anyone whose eating is light on dairy. The capsule is plant-based.

Good To Know

The HMB here is a calcium salt, so the calcium arrives attached to the HMB rather than added on its own. Talk with your healthcare provider before use if you take thyroid medication, a tetracycline antibiotic or digoxin, because calcium binds some medicines in the gut, and mention any other vitamin D you take.