Succinic Acid for Type 2 Diabetes: Benefits, Research, and Precautions

Succinic acid is a natural substance involved in cellular energy metabolism. In recent years, it has attracted attention from researchers as a potential supportive agent for type 2 diabetes mellitus. Let's explore what scientific data reveals about its effectiveness and how to use it properly.

What is succinic acid and how does it work?

Succinic acid is a natural metabolite produced in the body and involved in the Krebs cycle — a key process of cellular respiration. It improves ATP production (the cell's main energy source), possesses antioxidant properties, and stimulates metabolism.

In type 2 diabetes, the body experiences chronic energy deficiency despite excess blood glucose. Cells lose sensitivity to insulin, preventing glucose from entering them. Succinic acid helps improve energy metabolism and reduce oxidative stress, which plays a significant role in the development of diabetic complications.

Scientific research: what has been proven?

Blood sugar reduction

In 2024, a study on rats with type 2 diabetes showed impressive results: a combination of succinic and oleic acids reduced blood glucose levels by 35.7%. Additionally, the supplement:

• reduced the activity of gluconeogenesis enzymes (which produce new glucose in the liver);
• improved the activity of glucose-breaking enzymes;
• restored antioxidant defenses (catalase and superoxide dismutase);
• increased the number and size of pancreatic islets (where insulin is produced).

It is important to note that this study was conducted on animals, and the results cannot be automatically extrapolated to humans. Nevertheless, they provide grounds for further investigation.

Help for diabetic neuropathy

The most convincing data concerns the treatment of diabetic polyneuropathy — one of the most common complications of type 2 diabetes. The CYLINDER clinical trial (2022) involving 216 patients studied a combination of succinic acid with inosine, nicotinamide, and riboflavin.

Results:

• After 12 weeks, neuropathy symptoms decreased significantly more than in the placebo group (TSS score decreased by 2.65 vs. 1.73).
• By day 11, numbness and paresthesia (pins-and-needles sensation) had diminished.
• By day 57, the intensity of burning sensation had decreased.
• The effect was achieved regardless of HbA1c levels.

These findings support recommending a course of succinic acid-based preparations to relieve neuropathy symptoms in patients with type 2 diabetes.

Enhancing insulin action

A Russian experimental study (Perm State Pharmaceutical Academy) showed that a succinic acid derivative (4-amino-benzoyl hydrazide) potentiates the hypoglycemic effect of insulin, increases glucose tolerance, and reduces the hyperglycemic effect of adrenaline. The compound's effect was comparable to gliclazide, a well-known antidiabetic drug.

Supplement manufacturers: claims vs. reality

Instructions for dietary supplements (e.g., «GLS Succinic Acid») state that the product «helps lower blood sugar levels and reduce the risk of developing type 2 diabetes.» However, it is important to understand that these claims are based on theoretical assumptions and isolated studies, not large-scale clinical trials.

Key distinction: succinic acid in combination preparations (with inosine, riboflavin, nicotinamide) has demonstrated effectiveness for neuropathy. However, there is insufficient evidence that succinic acid mono-preparations effectively lower blood sugar in humans with type 2 diabetes.

Usage recommendations

If your doctor approves taking succinic acid, the general recommendations are:

• Dosage:1 capsule (400–500 mg) twice daily with meals.
• Duration:1 month, followed by a break (as agreed with your doctor).
• Form:capsules, tablets, or solution. The solution is better absorbed but contraindicated in case of gastrointestinal problems.

Some sources suggest an intermittent schedule: 2–3 days of intake followed by 2 days off for 2 weeks. However, do not self-medicate — the regimen should be determined by a doctor based on your condition.

Contraindications and precautions

Despite its natural origin, succinic acid has several contraindications:

Also note that long-term use of high doses of succinic acid can erode tooth enamel.

Key takeaways

1. Succinic acid does not replace primary diabetes treatment— it can only be an supportive measure after consulting your doctor.
2. The most proven benefitis the reduction of diabetic neuropathy symptoms (numbness, burning, pins-and-needles) when taken in combination with other antioxidants (CYLINDER clinical trial).
3. Evidence for blood sugar loweringcomes mainly from animal studies; its effect in humans requires confirmation.
4. Before purchasing any supplement, consult your endocrinologist — succinic acid has contraindications.
5. Do not exceed the dosage— excess acid irritates the gastrointestinal tract and may worsen your condition.

This article is for informational purposes only and is not a guide for self-treatment. All decisions regarding the use of any supplements should be made only after consultation with your attending endocrinologist.