Most adults need roughly 24 to 26 mg of valine per kilogram of body weight each day. For a 70 kg (154 lb) person, that works out to about 1.7 to 1.8 grams daily. The average adult in Western countries already consumes around 3.8 grams of valine per day through regular food, so deficiency is uncommon for people eating a varied diet.
Daily Requirements by Body Weight
Valine is one of nine essential amino acids, meaning your body can’t produce it and must get it from food. Several research methods have arrived at slightly different estimates for how much you need. Older tracer studies placed the requirement at about 16 to 17 mg per kg of body weight per day, while newer methods using the indicator amino acid oxidation technique suggest a higher figure of around 47 mg per kg per day. A practical middle-ground recommendation for healthy adults falls in the range of 24 to 26 mg per kg per day.
Here’s what that looks like at different body weights:
- 55 kg (121 lb): roughly 1.3 to 1.4 g per day
- 70 kg (154 lb): roughly 1.7 to 1.8 g per day
- 85 kg (187 lb): roughly 2.0 to 2.2 g per day
- 100 kg (220 lb): roughly 2.4 to 2.6 g per day
These numbers represent the minimum to maintain nitrogen balance and normal protein turnover. People with higher physical demands, or those who are pregnant, will need more.
Requirements During Pregnancy
Pregnant women need substantially more valine than the general adult population. Factorial estimates based on the increased protein demands of pregnancy put the estimated average requirement at 25 mg per kg per day, with the recommended dietary allowance set at 31 mg per kg per day. For a 70 kg pregnant woman, that translates to roughly 2.2 grams daily. These figures are derived from calculations rather than direct studies on pregnant women, so they represent the best available estimate rather than a precisely measured value.
What Valine Does in Your Body
Valine is one of three branched-chain amino acids (BCAAs), alongside leucine and isoleucine. All three share a similar structure and compete for the same absorption pathways in the gut and the same transport channels into muscle tissue. What makes valine distinct from its two siblings is its role in energy production. When your muscles break down valine, they release intermediate compounds into the bloodstream. One of these, 3-hydroxyisobutyrate, travels to the liver and kidneys where it serves as a raw material for making new glucose. This gluconeogenic pathway essentially allows valine burned in muscle to fuel blood sugar production elsewhere in the body, which matters during prolonged exercise or fasting.
Beyond energy metabolism, valine contributes to muscle protein synthesis, tissue repair, and maintaining nitrogen balance, the equilibrium between protein being built and protein being broken down.
How Valine Relates to Other BCAAs
Valine doesn’t work in isolation. The three BCAAs compete with each other for intestinal absorption, and leucine in particular is a potent competitive inhibitor of valine uptake. This means that taking a large dose of leucine on its own can reduce how much valine your body actually absorbs. Isoleucine and the amino acid methionine also compete with valine through the same mechanism.
This competition is one reason BCAA supplements typically come in a fixed ratio rather than as single amino acids. The most common research-supported requirement pattern puts leucine at roughly 40 mg per kg, isoleucine at about 19 mg per kg, and valine at 17 to 25 mg per kg. That gives a rough leucine-to-isoleucine-to-valine ratio of about 2:1:1, which is the ratio you’ll see in most commercial BCAA products. If you’re supplementing, sticking close to this ratio helps ensure none of the three gets crowded out during absorption.
Food Sources and Typical Intake
Data from the European Prospective Investigation into Cancer and Nutrition (EPIC) shows that the average adult already consumes about 3.8 grams of valine daily from food alone. That’s well above even the higher-end requirement estimates for most body weights, which explains why valine deficiency is rare outside of severe malnutrition or very restrictive diets.
Valine is found in virtually all protein-rich foods. Dairy products, eggs, meat, fish, and poultry are the most concentrated sources. Among plant foods, soy products, lentils, chickpeas, peanuts, and whole grains provide meaningful amounts. A single chicken breast contains roughly 1.5 grams of valine, a cup of cooked lentils provides about 0.8 grams, and a cup of Greek yogurt delivers around 0.6 grams. If you’re eating enough total protein throughout the day, you’re almost certainly meeting your valine needs without thinking about it.
Supplementation and Safety
No official Tolerable Upper Intake Level has been established for valine, which means there isn’t a specific ceiling above which intake is considered unsafe. That doesn’t mean more is better. Taking high doses of valine as a standalone supplement can disrupt nitrogen balance, forcing your kidneys to work harder to clear the excess. In children, single amino acid supplements have been linked to growth problems.
For athletes interested in BCAA supplementation, the recommended total BCAA intake from one recent analysis is 0.144 grams per kg per day, with the valine portion at 0.047 grams per kg per day. For a 70 kg person, that’s about 3.3 grams of valine daily. Since the average diet already provides 3.8 grams, supplementation on top of a protein-adequate diet offers diminishing returns for most people.
If you do supplement, choose a combined BCAA product rather than valine alone. Taking large amounts of any single branched-chain amino acid can suppress absorption of the other two, potentially creating an imbalance that wouldn’t exist with whole food protein.